Reaching for the Stars: India's Space Programme and Policy

India's space programme is the country's organised effort to build and use space technology for development, science and national security, led by the Indian Space Research Organisation (ISRO) under the Department of Space. It began in the 1960s with sounding rockets fired from a fishing village in Kerala, grew into one of the world's most cost-effective space programmes, and has now entered a new phase in which private companies build rockets and satellites alongside the state. For UPSC, this topic sits at the intersection of science, economy and governance: it asks how a developing country used space for literacy, weather forecasting and disaster warning, and how it now plans to become a space power by 2047.

From Thumba to the Moon: the evolution of the programme

INCOSPAR (the Indian National Committee for Space Research) was set up in 1962 under physicist Vikram Sarabhai, the founding father of the programme. In 1963, India launched its first sounding rocket from Thumba, a fishing village near Thiruvananthapuram chosen for its proximity to the magnetic equator. The message was clear from the start: space would serve development, not prestige.

In 1969, INCOSPAR was reconstituted as ISRO, and in 1972 the Department of Space and the Space Commission were created to give the programme direct government backing. Aryabhata, India's first satellite, was launched in 1975 with Soviet assistance. The 1980s and 1990s built the workhorses: the ASLV launcher, the INSAT series for communication and broadcasting, and the IRS series for remote sensing.

The PSLV (Polar Satellite Launch Vehicle) became operational in 1994 and earned a reputation for remarkable reliability, going on to launch foreign satellites commercially. The 2000s and 2010s were the deep-space decades: Chandrayaan-1 (2008), the Mars Orbiter Mission (2013) and Chandrayaan-3 (2023). Today the programme is stepping into human spaceflight with Gaganyaan and a planned national space station.

Why space matters: development, security and self-reliance

The programme's founding logic was developmental. INSAT and GSAT satellites carry telemedicine, tele-education and disaster communication to remote districts. IRS satellites feed weather forecasting, crop assessment, groundwater mapping and resource surveys. NavIC (Navigation with Indian Constellation), India's regional satellite navigation system built around seven satellites, gives the country an independent positioning service for transport, disaster management and strategic users.

Space is also strategic. Satellites provide surveillance and secure communication, and in 2019 Mission Shakti demonstrated an anti-satellite (ASAT) capability by destroying one of India's own satellites in low orbit. The third pillar is self-reliance: mastering the cryogenic engine, which burns super-cooled liquid hydrogen and liquid oxygen, freed India's heavy rockets from dependence on foreign upper stages and made the GSLV and LVM3 possible.

In January 2025, the GSLV-F15 rocket lifted off from Sriharikota carrying NVS-02, the second of ISRO's new-generation navigation satellites. The flight was ISRO's 100th launch from the Satish Dhawan Space Centre, and it strengthened NavIC, India's regional navigation system: a constellation of seven satellites, three in geostationary orbit and four in geosynchronous orbit, giving the country an independent positioning service across India and about 1,500 km beyond its borders.

NVS-02 carries navigation payloads in the L1, L5 and S frequency bands plus a C-band ranging payload, and uses rubidium atomic clocks for precise timekeeping. A rubidium atomic clock is an ultra-precise timekeeper that uses the natural vibration frequency of rubidium atoms as its metronome; because satellite navigation is really about measuring tiny differences in signal arrival times, such clocks are what make metre-level positioning possible.

GNSS spoofing is an attack in which a transmitter broadcasts fake navigation signals that overpower a receiver's genuine ones, making the device report a false position. Unlike jamming, which simply drowns out signals, spoofing actively deceives: aircraft have been misled about their position, with flight-management systems fed false data on location, speed and altitude.

India's aviation regulator responded in January 2026, when the DGCA directed pilots and air-traffic controllers around Delhi airport to report suspected spoofing or jamming within 10 minutes of occurrence. DGCA data cited about 465 GPS interference and spoofing incidents between November 2023 and February 2025, mostly near Amritsar and Jammu. The defences are signal authentication to verify that a navigation signal is genuine, encryption of military navigation codes, and multi-sensor fusion, which cross-checks satellite data against radar, inertial systems and ground-based aids so that one spoofed source cannot silently take over.

Who does what: the institutional architecture

The space sector reforms of 2020 gave each institution a distinct role. For UPSC, the standard test is simple: which institution regulates, which researches, and which sells.

The rockets: PSLV, GSLV, LVM3 and the road to reusability

Rockets are the foundation of any space programme. The PSLV (Polar Satellite Launch Vehicle), operational since 1994, is ISRO's trusted workhorse: a four-stage rocket famous for reliability and for launching 104 satellites in a single flight in 2017, a world record at the time. It carried Chandrayaan-1, the Mars Orbiter Mission and Aditya-L1.

The GSLV (Geosynchronous Satellite Launch Vehicle) gave India the ability to place heavy communication satellites in geostationary transfer orbit (GTO). Its third stage uses an indigenous cryogenic engine, a technology mastered after years of denied access, with the first successful flight of the indigenous stage (GSLV-D5) in 2014. The LVM3 (Launch Vehicle Mark 3), earlier called GSLV Mk III, is India's heaviest operational rocket: it launched Chandrayaan-2, Chandrayaan-3 and the OneWeb satellites, and its human-rated version, HLVM3, will carry Gaganyaan's crew.

The next leap is reusability, recovering and reflying rocket stages to slash launch costs. ISRO's RLV-TD (Reusable Launch Vehicle Technology Demonstrator), named Pushpak, has successfully demonstrated autonomous landing, and the Next-Generation Launch Vehicle (NGLV), targeted for 2032, is being designed as a reusable heavy launcher. For smaller payloads, the SSLV (Small Satellite Launch Vehicle) offers quick, on-demand launches, a product aimed squarely at the commercial small-satellite market.

The most demanding technology in a launcher is its cryogenic stage. A cryogenic engine burns liquid hydrogen (stored at minus 253°C) with liquid oxygen (at minus 183°C), reaching a specific impulse of about 450 seconds, far above the roughly 290 to 320 seconds of a conventional liquid engine like Vikas, and its exhaust is essentially water vapour. Specific impulse is the standard measure of rocket-engine efficiency: how much thrust an engine gets from each unit of propellant, so higher numbers mean less fuel carried for the same job. India's indigenous CE20 engine, which powers the upper stage of the LVM3, marks the country's mastery of this once-denied technology.

Further ahead lies the scramjet, or supersonic combusting ramjet: an air-breathing engine that burns fuel in supersonic airflow, working efficiently at hypersonic speeds above Mach 6. Because it draws oxygen from the atmosphere instead of carrying oxidiser on board, it can be far more efficient than a rocket, but igniting fuel in a Mach-6 airstream is like keeping a candle lit in a hurricane. ISRO has flight-tested scramjet technology, and it underpins long-term concepts for reusable spaceplanes and hypersonic vehicles.

Indian Space Policy 2023: opening the final frontier

Unveiled in April 2023, the Indian Space Policy 2023 is the first comprehensive policy for the sector. Its core idea is a level playing field: Non-Governmental Entities (NGEs) can now undertake end-to-end space activities, from owning and operating satellites to building launch vehicles, running ground stations and selling satellite-based services. ISRO, in turn, is to concentrate on cutting-edge research, deep-space exploration and new technology development, handing routine operational work to industry.

The policy also promises clear frameworks for authorisation, licensing and liability. This matters because private investors need to know who bears responsibility if a privately owned satellite damages another object in orbit, a question governed internationally by the Liability Convention of 1972.

The Artemis Accords: rules for the return to the Moon

The Artemis Accords are a US-led set of non-binding principles for the responsible civil exploration of the Moon, Mars and beyond, launched in 2020 by NASA and the US Department of State with seven founding partners; India signed in June 2023. Built on the Outer Space Treaty of 1967, they commit signatories to peaceful purposes, transparency about space policies, interoperability of systems, emergency assistance to astronauts in distress, registration of space objects, coordination to avoid harmful interference, preservation of historic space sites, and resource extraction consistent with the Outer Space Treaty.

For India, the Accords matter because the Chandrayaan missions, the planned LUPEX/Chandrayaan-5 collaboration with Japan and the 2040 crewed-Moon goal all operate in the same crowded lunar neighbourhood the Accords seek to keep orderly.

The private surge: startups, FDI and funding

The 2020 reforms opened the sector, and startups moved in quickly. Skyroot Aerospace launched Vikram-S, India's first privately built rocket, in 2022. Agnikul Cosmos is developing the Agnibaan launcher with 3D-printed engines. Pixxel builds hyperspectral imaging satellites, Dhruva Space offers satellite deployment platforms, and GalaxEye launched Mission Drishti in May 2026, billed as the world's first satellite combining optical and radar imaging on a single platform.

Capital followed policy. The FDI amendment of 2024 allows 100 per cent foreign investment under the automatic route for manufacturing satellite components and sub-systems, 74 per cent for satellite manufacturing and operation, and 49 per cent for launch vehicles and spaceports. A Rs 1,000 crore venture capital fund under IN-SPACe supports startups and MSMEs, and the ecosystem now counts hundreds of startups with investments running into hundreds of millions of dollars.

The logic of privatisation is straightforward: demand for communication, navigation, Earth observation and broadband far exceeds what ISRO alone can supply; private competition lowers costs, as SpaceX demonstrated globally; and it frees ISRO's scientists to focus on the Moon, Mars and human spaceflight instead of routine launches.

The space economy: size, share and ambition

The space economy is the full range of activities and the use of resources that create value and benefits for human beings in the course of exploring, researching, understanding, managing and utilising space (OECD definition). A World Economic Forum report estimated the global space economy at 613 billion dollars in 2025 and projected it to nearly triple to 1.8 trillion dollars by 2035, growing faster than global GDP, with over 60 per cent of that growth expected to come from industries such as supply chain and transportation, food and beverage, defence, retail, consumer goods and digital communications.

India's calling card in this market is cost-effectiveness. The PSLV-C37 flight of February 2017 launched 104 satellites in a single mission, a world record at the time, and ISRO's record of frugal, reliable launches is what lets Indian startups undercut global rivals.

The constraints are familiar. Talent drains toward NASA and ESA, specialised aerospace skills are scarce at home, there is no robust dispute-settlement mechanism for commercial space deals (the Antrix-Devas case still looms over investors), and the space budget sits at about 0.04 per cent of GDP, which the policy debate says must rise toward 0.5 per cent to build real research depth.

Satellite internet and the mega-constellation race

Satellite internet is broadband beamed from orbiting satellites instead of carried through ground cables. It works where fibre cannot reach: ships, aircraft, border posts and disaster zones. Its performance depends on orbital altitude, which is why the industry is racing to build LEO mega-constellations.

LEO mega-constellations such as Starlink, OneWeb and Kuiper place thousands of small satellites between roughly 300 and 1,200 km. They deliver high bandwidth with very low latency, but each satellite sees only a small patch of Earth and streaks overhead at about 27,000 km per hour. Two technologies make the system work: optical inter-satellite links, which are laser beams letting satellites pass data to each other directly instead of bouncing everything off ground stations, and steerable phased-array antennas, which let a ground terminal hand its connection from one fast-moving satellite to the next without dropping it.

The technology is dual-use, serving civilians and soldiers alike. Satellite internet kept Ukrainian command networks running during the war with Russia and supports Indian logistics in places like the Siachen Glacier. The risks are real too: terminals have been smuggled across borders by insurgents, thousands of new satellites worsen the space debris problem, and dependence on foreign constellations raises strategic questions for India.

Space tourism: the newest frontier

Space tourism is the commercial business of carrying civilians to space for recreation, research or observation, through suborbital hops, orbital stays or, eventually, lunar flybys. Companies like SpaceX, Blue Origin, Virgin Galactic and Axiom Space are its pioneers, and reusable rockets have begun to bring costs down from the tens of millions of dollars. Some analysts project the market could be worth several billion dollars by 2030, though estimates vary widely.

Beyond revenue, tourism funds innovation in propulsion and crew safety, and private missions such as Axiom-4 have carried out genuine microgravity research. The challenges are steep: tickets still cost from about 600,000 dollars to 70 million dollars, raising questions of equity; safety risks from radiation and high acceleration remain; rocket soot is a potent pollutant; and there is no comprehensive global framework governing who may fly, who is liable for accidents, and how tourist traffic is kept clear of satellites.

India got its own milestone in May 2024, when pilot Gopi Thotakura flew aboard Blue Origin's NS-25 mission, becoming the first Indian space tourist and only the second Indian to travel to space after Rakesh Sharma's 1984 flight. The New Shepard suborbital hop lasted about eleven minutes: a reminder that the new space economy is not only about satellites and science, but also about selling the view.

Challenges on the road to Space Vision 2047

The biggest gap is legal. India still has no comprehensive Space Activities Act: IN-SPACe operates without statutory backing, and rules on licensing, liability and dispute resolution remain fragmented across old policies. Investor confidence needs a single, predictable law.

Money and infrastructure are the next constraints. ISRO's annual budget of roughly 1.7 billion dollars is a fraction of NASA's 25 billion dollars. India still imports far more space components than it exports, testing facilities are limited, and a third launch pad at Sriharikota (approved in 2025 at about Rs 3,985 crore) and a dedicated small-satellite spaceport at Kulasekarapattinam in Tamil Nadu (about Rs 986 crore, targeted for 2026-27) are still under construction. Talent is the third constraint: bright engineers continue to leave for opportunities abroad.

The government's answer is Space Vision 2047, a roadmap to make India a global space power by the centenary of independence.

The way forward is clear: enact the Space Activities Bill and give IN-SPACe statutory status, set deadlines for ISRO's shift to a research-focused role, clarify FDI and procurement rules, build launch and testing infrastructure with private partners, and write binding national rules for debris mitigation and space traffic management.

Toll booths from orbit: satellite-based tolling

Satellite-based tolling collects road tolls by tracking a vehicle's distance travelled on tolled roads through real-time satellite navigation, replacing physical toll plazas. It rests on GNSS, the Global Navigation Satellite System, an umbrella term for the world's navigation constellations: GPS (USA), GLONASS (Russia), Galileo (EU) and BeiDou (China), augmented over India by GAGAN, the GPS-Aided GEO Augmented Navigation system jointly developed by ISRO and the Airports Authority of India for high positional accuracy.

For India the attraction is clear: barrier-free tolling cuts congestion, fuel waste and leakages, extending the logic of FASTag into a fully digital system. The policy homework is a space-based navigation framework with robust licensing, FDI, cybersecurity and encryption norms.

Key Terms

• India's space programme: India's space programme is the civilian space effort begun with INCOSPAR in 1962, reconstituted as ISRO in 1969, and given direct government backing through the Department of Space and the Space Commission in 1972. Built on Vikram Sarabhai's development-first vision, it progressed from Aryabhata (1975) through the INSAT and IRS satellite series and the PSLV workhorse to Chandrayaan, the Mars Orbiter Mission and the Gaganyaan human spaceflight programme. Example: The Mars Orbiter Mission of 2013 made India the first country to reach Mars orbit on its maiden attempt.
• Department of Space: The Department of Space (DoS) is the Government of India department, under the Prime Minister's Office, that oversees the country's space programme. It administers ISRO, and after the 2020 space-sector reforms it also oversees IN-SPACe (the regulator and promoter for private players) and NewSpace India Limited (the commercial arm). All national space policy, from launch authorisations to international cooperation, flows through this department. Example: The Indian Space Policy 2023, which opened the sector to private participation, was issued under the Department of Space.
• INCOSPAR: INCOSPAR (Indian National Committee for Space Research) was the body set up in 1962 under Vikram Sarabhai within the Department of Atomic Energy to organise India's space research. It established the Thumba Equatorial Rocket Launching Station in 1963 and became ISRO in 1969. It matters for UPSC because it marks the institutional birth of the Indian space programme in science-and-technology questions. Example: The first sounding rocket launched from Thumba in November 1963, carried on a bicycle to the launch pad, is the iconic origin story of INCOSPAR-era space research.
• Vikram Sarabhai: Vikram Sarabhai was the physicist regarded as the father of India's space programme. He founded the Indian National Committee for Space Research (INCOSPAR) in 1962, which became ISRO in 1969, and established the Thumba Equatorial Rocket Launching Station. He argued that space technology must serve development, from satellites to communication. For UPSC, he is the indispensable GS-III name for science and technology and space history. Example: the founding of ISRO in 1969
• Thumba: Thumba is India's first rocket-launching station, the Thumba Equatorial Rocket Launching Station (TERLS) on the Kerala coast near Thiruvananthapuram. Lying close to the magnetic equator, it was ideal for sounding-rocket experiments, and its first launch, a Nike-Apache on 21 November 1963, marks the birth of the Indian space programme. For UPSC prelims, Thumba is the classic 'cradle of ISRO' fact, and in mains it anchors the story of India's space institutions. Example: the Nike-Apache launch of 21 November 1963
• ISRO: ISRO, the Indian Space Research Organisation, is India's national space agency, established in 1969 (reconstituting INCOSPAR of 1962) under the Department of Space and headquartered in Bengaluru. Guided by Vikram Sarabhai's vision of space for development, it built the PSLV and GSLV launchers and missions ranging from Aryabhata (1975) to Chandrayaan-3 and the Mars Orbiter Mission. Example: Chandrayaan-3's soft landing near the Moon's south pole on 23 August 2023 made India the fourth country to soft-land on the Moon.
• Space Commission: The Space Commission is the apex policy-formulating body for India's space programme, constituted in 1972 along with the Department of Space. Chaired by the Chairman of ISRO (who also serves as Secretary, Department of Space), it oversees the formulation of space policy, approves major programmes and missions, and guides the overall direction of the Indian space effort. Example: The Space Commission's approval of major mission proposals such as Chandrayaan and Gaganyaan before they go to the Union Cabinet for funding.
• Aryabhata: Aryabhata was India's first satellite, launched in 1975 with Soviet assistance, soon after INCOSPAR was reconstituted as ISRO and the Department of Space and the Space Commission were created in 1972. It was named after the Gupta-era mathematician-astronomer Aryabhata.
• ASLV: The Augmented Satellite Launch Vehicle, ISRO's solid-propellant launch vehicle flown in four developmental flights between 1987 and 1994. Designed to place about 150 kg payloads in low earth orbit, its mixed record provided the staging experience that fed into the PSLV programme. Example: after the 1987 and 1988 failures, ASLV succeeded in 1992 and 1994, and the vehicle was then retired. Example: ISRO's 1987-1994 launch vehicle with 150 kg LEO capacity; succeeded in 1992 and 1994 after two initial failures.
• INSAT: INSAT, the Indian National Satellite system, is India's series of geostationary satellites for telecommunications, broadcasting, meteorology and disaster warning. Built up through the 1980s and 1990s, it became the backbone of Indian television, DTH services and weather observation. Example: INSAT satellites underpin DTH television, cyclone tracking and disaster communication across India.
• IRS: IRS is the Indian Remote Sensing satellite series, ISRO's Earth observation satellites that image the planet for agriculture, water resources, disaster management, urban planning and defence. Beginning with IRS-1A in 1988, the series made India self-reliant in civilian remote sensing and feeds applications such as crop forecasting and the Bhuvan geoportal. Example: IRS-1A, launched in 1988, was India's first operational remote sensing satellite.
• PSLV: The Polar Satellite Launch Vehicle is ISRO's workhorse expendable launch vehicle, a four-stage rocket using solid and liquid stages that is best known for placing satellites into sun-synchronous polar orbits. Operational since the 1990s, it has an exceptional reliability record and has launched landmark missions including Chandrayaan-1 and the Mars Orbiter Mission. It also serves the commercial market through dedicated commercial launches. Example: The PSLV-C37 mission in 2017 set a world record by deploying 104 satellites in a single flight.
• Chandrayaan-1: Chandrayaan-1 is India's first lunar mission, launched by ISRO on 22 October 2008. The orbiter carried eleven scientific payloads, including NASA's Moon Mineralogy Mapper, and its data provided decisive evidence of water molecules on the lunar surface, reshaping lunar science. It also released an impact probe that struck near Shackleton crater. For UPSC, the mission established India as a deep-space actor and anchors questions on space science and technology missions. Example: The Moon Mineralogy Mapper's 2009 detection of hydroxyl and water molecules across the lunar surface remains the mission's landmark finding.
• Mars Orbiter Mission: India's first interplanetary mission, launched by ISRO on 5 November 2013 aboard PSLV-C25 from Sriharikota, which entered Mars orbit on 24 September 2014. Built at a cost of about Rs 450 crore, it made India the first nation to reach Mars on its maiden attempt and only the fourth space agency to orbit the red planet. It studied the Martian surface, atmosphere and methane. Example: The mission's success on a shoestring budget became a global showcase of frugal engineering in space exploration.
• Chandrayaan-3: Chandrayaan-3 is ISRO's second lunar landing attempt and the mission that made India the first country to soft-land near the Moon's south pole, on 23 August 2023, and only the fourth country to soft-land on the Moon. Its Vikram lander and Pragyan rover confirmed the presence of sulphur and other elements in the lunar soil during their brief surface mission. For UPSC, it is the flagship example of frugal, indigenous space engineering for science and technology answers. Example: The Vikram lander touched down near 69 degrees south latitude, a region chosen for its permanently shadowed craters and water-ice potential.
• Gaganyaan: Gaganyaan is ISRO's human spaceflight programme, India's first crewed orbital mission. It will use the human-rated LVM3 launcher from Sriharikota to carry up to three astronauts in a crew module to low Earth orbit for about three days. The programme includes uncrewed test flights, the Vyommitra humanoid robot, crew escape system trials and astronaut training. Success would make India the fourth nation with independent human spaceflight. For UPSC it is the flagship of India's space ambitions. Example: The October 2023 TV-D1 test flight that validated the crew escape system.
• GSAT: GSAT is the name of India's series of geostationary communication satellites, built and launched by ISRO, which provide telecommunications, direct-to-home broadcasting, broadband, weather and navigation services from geostationary orbit. The INSAT and GSAT series together form the backbone of India's space-based communication infrastructure. Example: GSAT-7, also called Rukmini, provides communication services for the Indian Navy.
• NavIC: Navigation with Indian Constellation, ISRO's independent regional satellite navigation system built around seven satellites in geostationary and inclined geosynchronous orbits. It provides positioning, navigation and timing services over India and about 1,500 kilometres beyond its borders, through a free Standard Positioning Service and an encrypted Restricted Service for strategic users. Example: NavIC signals are used in transport fleet tracking, disaster management, and timing synchronisation for power grids and telecom networks.
• Mission Shakti: Mission Shakti is the codename for India's 2019 anti-satellite (ASAT) test, which demonstrated the capability by destroying one of India's own satellites in low orbit. It marked the strategic dimension of the space programme, alongside surveillance and secure communication satellites.
• cryogenic engine: A rocket engine that burns propellants liquefied at extremely low temperatures, typically liquid hydrogen as fuel with liquid oxygen as oxidiser. Cryogenic stages are highly efficient and are used in the upper stages of launch vehicles to place heavy satellites into high orbits. Mastering this technology was a major milestone for ISRO after technology-denial regimes blocked its import in the 1990s. Example: ISRO's indigenous CE-20 cryogenic engine powers the upper stage of the LVM3 rocket that launched Chandrayaan-3 in 2023.
• GSLV: GSLV stands for Geosynchronous Satellite Launch Vehicle, ISRO's three-stage launch vehicle designed to place heavier satellites into geostationary transfer orbit. Its stages use solid, liquid and cryogenic propulsion, with the indigenous cryogenic upper stage being its defining technological feature. Example: GSLV-F16 launched the NASA-ISRO NISAR Earth-observation mission on 30 July 2025.
• LVM3: LVM3, the Launch Vehicle Mark-3 (earlier called GSLV Mk III), is ISRO's heavy-lift rocket and the workhorse for India's most ambitious missions. A three-stage vehicle with two solid strap-on boosters, a liquid core stage and an indigenous cryogenic upper stage, it can place about 8 tonnes in low Earth orbit and 4 tonnes in geosynchronous transfer orbit. It has launched Chandrayaan-2, Chandrayaan-3 and the Gaganyaan uncrewed test flights, and is the designated launcher for the Gaganyaan human spaceflight mission. Example: Chandrayaan-3 rode to space on the LVM3-M4 flight in July 2023, the mission that achieved India's historic soft landing near the lunar south pole the following month.
• indigenous cryogenic engine: An indigenous cryogenic engine is a rocket engine developed in India that burns supercooled liquid hydrogen as fuel with liquid oxygen as oxidiser, both stored at temperatures below minus 250 degrees Celsius. Cryogenic stages provide the high efficiency needed to place heavy communication satellites into geostationary transfer orbit. Mastering the technology ended India's dependence on foreign cryogenic stages. Example: ISRO's CE-7.5 engine, which powers the upper stage of the GSLV Mk-II and first flew successfully on the GSLV-D5 mission of 5 January 2014, making India one of the few countries with this capability.
• HLVM3: HLVM3 is the human-rated version of ISRO's LVM3 (Launch Vehicle Mark 3, earlier called GSLV Mk III), India's heaviest operational rocket. Human rating involves qualifying the vehicle for higher reliability standards, adding redundant systems and integrating a crew escape system that can pull the crew module away in an emergency. HLVM3 is designated to launch the Gaganyaan crewed missions. Example: ISRO's uncrewed Gaganyaan test flights, including the TV-D1 crew escape system test in October 2023, are qualifying the systems that will fly on HLVM3.
• reusability: Reusability is the design principle that launch vehicles, or their stages, engines and fairings, should be recovered and flown multiple times rather than discarded after a single flight. It sharply lowers the cost of access to space, though it demands precise guidance, heat shielding and refurbishment capability. Reusable rockets are a key step toward affordable satellite launches and crewed missions. Example: SpaceX's Falcon 9 lands its first stage for reuse, and ISRO is building reusable capability through its Reusable Launch Vehicle landing experiments (RLV-LEX).
• RLV-TD: RLV-TD stands for Reusable Launch Vehicle Technology Demonstrator, ISRO's winged test vehicle for proving reusable spaceflight technology. Named Pushpak, it is designed to land horizontally on a runway like an aircraft after returning from space, which would sharply cut launch costs by reusing the vehicle. ISRO first flew it in a 2016 hypersonic test and later demonstrated autonomous runway landings through the LEX missions. Example: In RLV-LEX-02 (March 2024), Pushpak was released from an IAF Chinook helicopter at 4.5 km altitude and landed autonomously on the runway at Chitradurga, Karnataka.
• Pushpak: Pushpak is the name given to ISRO's winged Reusable Launch Vehicle Technology Demonstrator (RLV-TD), the test vehicle for India's reusable spaceplane program. It has successfully demonstrated autonomous runway landing in the RLV Landing Experiment (RLV-LEX) missions flown from the Aeronautical Test Range at Chitradurga. These experiments are stepping stones toward a fully reusable two-stage-to-orbit launch system that would sharply cut the cost of access to space. Example: The RLV-LEX landing experiments of 2023 and 2024, in which the winged Pushpak vehicle was released from a helicopter and landed autonomously on a runway
• SSLV: The Small Satellite Launch Vehicle is ISRO's 34-metre, on-demand launcher aimed at the commercial small-satellite market, capable of placing up to 500 kg into low Earth orbit. With three solid stages and a liquid Velocity Trimming Module, it needs minimal launch infrastructure and offers low-cost, quick-turnaround launches. Its developmental programme concluded with the successful SSLV-D3/EOS-08 flight in August 2024, after which the technology moved to Indian industry for commercial production. Example: The August 2024 SSLV-D3 mission that placed the EOS-08 earth observation satellite in orbit.
• Indian Space Policy 2023: The space policy approved by the Union Cabinet in April 2023 that clearly delineates the roles of ISRO, NewSpace India Limited (NSIL) and IN-SPACe, and opens the space sector to private participation across the value chain. Under the policy, IN-SPACe authorises and promotes private space activities, NSIL handles commercial operations, and ISRO focuses on research and development of advanced space technologies. Example: Private Indian companies can now build launch vehicles and satellites and offer space-based services under authorisation from IN-SPACe, which the policy designates as the single-window agency for non-governmental space activities.
• Liability Convention: The 1972 Convention on International Liability for Damage Caused by Space Objects, which makes the 'launching state' of a space object liable for damage it causes. Liability is absolute for damage on the Earth's surface, in the airspace, or to aircraft in flight, and fault-based for damage caused elsewhere in outer space. Claims are settled between states, normally through diplomatic channels. Example: After the Soviet satellite Cosmos 954 scattered radioactive debris over Canada in 1978, Canada invoked the Convention and the two states settled the claim through a 1981 protocol.
• Skyroot Aerospace: Skyroot Aerospace is a Hyderabad-based private space startup founded in 2018, India's first private company to build launch vehicles. On 18 November 2022 it launched Vikram-S, India's first privately developed rocket, on a suborbital test flight, and it is developing the orbital Vikram-1 launcher. It is a flagship example of the private space sector enabled by the 2020 space reforms and IN-SPACe. Example: The Vikram-S launch from Sriharikota on 18 November 2022, demonstrating private launch capability under the new Indian Space Policy framework.
• Agnikul Cosmos: Agnikul Cosmos is a Chennai-based private space startup incubated at IIT Madras, founded by Srinath Ravichandran and Moin SPM, that builds small-lift launch vehicles with 3D-printed engines. It is part of India's post-2020 private space ecosystem enabled by IN-SPACe. Its work demonstrates how additive manufacturing can cut rocket engine production time and cost. Example: On 30 May 2024 it flew Agnibaan SOrTeD, a sub-orbital technology demonstrator powered by the world's first single-piece 3D-printed semi-cryogenic engine, from Dhanush, India's first private launchpad at Sriharikota.
• Pixxel: Pixxel is an Indian private space-technology company founded in 2019 by Awais Ahmed and Kshitij Khandelwal at BITS Pilani, building a constellation of hyperspectral imaging satellites. Its satellites capture light across more than 135 narrow spectral bands at about 5-metre resolution, detecting crop disease, methane leaks, illegal mining and water stress that ordinary cameras cannot see, and it now operates the Firefly constellation launched aboard SpaceX missions. Example: Pixxel's Firefly satellites sell daily hyperspectral imagery to clients in agriculture, mining, energy and defence, and the company leads the consortium building India's public-private Earth observation constellation under IN-SPACe.
• Dhruva Space: Dhruva Space is a Hyderabad-based private space-technology startup offering full-stack space services: satellite platforms, hosted payloads and deployment support, and ground-station services. It developed the P-DoT picosatellite platform and flew its first satellites, Thybolt-1 and Thybolt-2, aboard ISRO's PSLV-C54 in November 2022, demonstrating store-and-forward amateur radio communication. It has since flown hosted-payload missions under its LEAP programme and was selected by IN-SPACe to develop an indigenous small-satellite bus. Example: Thybolt-1 and Thybolt-2, each weighing about 700 grams, relayed messages between amateur radio operators as they orbited Earth.
• GalaxEye: GalaxEye is an Indian space-technology startup building Earth-observation satellites that combine synthetic aperture radar (SAR) and optical imaging on a single platform. SAR imaging works through cloud cover and at night, so the fusion gives all-weather, day-and-night observation capability for defence, agriculture, insurance and disaster management applications. Example: GalaxEye launched its first satellite, Mission Drishti, in May 2026.
• Mission Drishti: Mission Drishti is the satellite mission of GalaxEye, a Chennai-based Indian private space startup, launched in May 2026. It is billed as the world's first satellite combining optical and synthetic aperture radar (SAR) imaging on a single platform, fusing the two sensor types so that imaging works day and night and through cloud cover. The mission is cited as an example of India's private space sector moving from services into satellite manufacturing. Example: GalaxEye's Mission Drishti, the first dual optical-plus-radar imaging satellite on one platform.
• FDI amendment of 2024: The FDI amendment of 2024 liberalised foreign direct investment in India's space sector to align with the Indian Space Policy 2023. Notified in April 2024 under the Foreign Exchange Management (Non-Debt Instruments) Rules, it permits up to 100 percent FDI: automatic up to 74 percent for satellites manufacture and operation and satellite data products, automatic up to 49 percent for launch vehicles and spaceports, and fully automatic for manufacturing components and systems for satellites, ground segment and user segment. It aims to attract global space firms and integrate Indian manufacturers into global value chains. Example: A foreign firm can now set up a satellite component manufacturing unit in India with 100 percent automatic-route FDI.
• SpaceX: SpaceX (Space Exploration Technologies Corp.) is an American private aerospace company founded by Elon Musk in 2002. It revolutionised the launch industry with the reusable Falcon 9 rocket, the Falcon Heavy, the Starship super-heavy vehicle, the Dragon crew capsule that ferries NASA astronauts to the ISS, and the Starlink satellite internet constellation. Its low-cost, high-cadence launches forced global competitors, including ISRO's commercial arm, to rethink pricing and reusability. Example: The Falcon 9's routine recovery and reuse of its first-stage booster, which cut launch costs dramatically.
• Satellite internet: Satellite internet provides broadband connectivity through constellations of satellites in low Earth orbit, with user terminals linking directly to space instead of through ground cables. It can reach remote and rural areas where laying fibre is uneconomical, though it typically costs more and has higher latency than fibre. It is increasingly relevant to bridging India's digital divide. Example: Starlink and Eutelsat OneWeb constellations offering satellite broadband services.
• LEO mega-constellations: LEO mega-constellations are planned networks of hundreds or thousands of small satellites in low Earth orbit, roughly 300 to 1,200 km above the Earth, built mainly to provide global broadband internet. By placing many satellites in close orbital shells, operators such as SpaceX's Starlink, Eutelsat OneWeb and Amazon's Project Kuiper promise high-speed, low-latency coverage even in remote areas. They have transformed space policy debates around orbital congestion, collision risk, light pollution for astronomy, spectrum sharing and the licensing of foreign constellations in countries like India. Example: SpaceX's Starlink, with several thousand satellites already in orbit, is the largest mega-constellation in service and the reference point for India's rules on licensing foreign satellite broadband providers.
• Starlink: Starlink is a satellite-internet constellation operated by SpaceX, comprising thousands of low-Earth-orbit satellites providing broadband connectivity, especially to remote and underserved areas. It is the world's largest satellite constellation and a leading example of commercial space services, with regulatory and spectrum debates in India over its entry into the Indian market. Example: Starlink's services being used for connectivity in disaster-hit or remote regions where terrestrial networks are unavailable.
• OneWeb: A global low-Earth-orbit satellite broadband constellation, now part of the Eutelsat Group after the 2023 merger, in which India's Bharti Enterprises is a major shareholder. Its network of several hundred satellites provides internet connectivity to remote and underserved regions where terrestrial networks do not reach. It represents India's strategic entry into the global space-based broadband market. Example: OneWeb satellites provide backhaul and connectivity in remote regions where laying fibre or building towers is uneconomical.
• Kuiper: Kuiper refers to Project Kuiper, Amazon's planned mega-constellation of thousands of broadband internet satellites in low Earth orbit, between roughly 300 and 1,200 km altitude. Like SpaceX's Starlink and Eutelsat OneWeb, it aims to deliver high-speed, low-latency internet to underserved and remote areas using a dense network of small satellites with inter-satellite links. Its entry into the satellite broadband race has sharpened debates over orbital congestion, spectrum allocation and the responsibilities of private operators in space. Example: Amazon began launching production Kuiper satellites in 2025 toward an initial constellation of over 3,000 satellites, positioning it as a direct competitor to Starlink in the global satellite broadband market.
• optical inter-satellite links: Optical inter-satellite links are laser-based communication links between satellites that transmit data as beams of light instead of radio waves. They offer far higher data rates, narrower beams that are harder to intercept, and lighter terminals than radio-frequency links. They are becoming standard in large satellite constellations and in secure military and government communication networks. Example: Modern satellite internet constellations use laser links so satellites can relay data among themselves in orbit without routing through ground stations.
• steerable phased-array antennas: A phased-array antenna is an antenna made of many small elements whose signals are combined electronically to form a beam that can be steered in any direction without physically moving the dish. When ground terminals use steerable phased-array antennas, they can hand a connection from one fast-moving low-Earth-orbit satellite to the next without dropping the link. This electronic beam-steering is what makes broadband-from-satellite constellations work in practice. Example: The flat, pizza-box-style terminals used by satellite broadband constellations track fast-moving satellites electronically rather than rotating a dish.
• space debris: Space debris is the population of defunct satellites, spent rocket stages, fragments and even paint flakes orbiting Earth at high velocity, which can destroy working spacecraft on collision. With mega-constellations multiplying, the risk of cascading collisions known as the Kessler syndrome has made debris mitigation and removal a policy priority. International guidelines now require satellites to be de-orbited at end of life. Example: ISRO's Project Netra tracks debris over the Indian region to protect Indian satellites from collisions.
• Space tourism: Space tourism is commercial travel to space by private individuals, currently offered as suborbital joyrides (a few minutes of weightlessness above the Karman line) by companies like Blue Origin and Virgin Galactic, or orbital stays, as pioneered by SpaceX's Inspiration4 and private missions to the International Space Station. It is enabled by reusable launch vehicles that are bringing down costs, but remains extremely expensive and raises questions of safety regulation, liability and environmental impact. Example: Blue Origin's New Shepard suborbital flights carrying paying passengers on brief trips past 100 km altitude.
• Blue Origin: An American private spaceflight company founded in 2000 by Jeff Bezos. It builds reusable rockets, beginning with the suborbital New Shepard vehicle used for space tourism and research flights, and the heavy-lift New Glenn rocket, which made its first flight in January 2025. It is also developing the Blue Moon lunar lander for NASA's Artemis programme, making it a leading private competitor in commercial spaceflight. Example: Blue Origin's New Shepard has carried paying tourists on suborbital hops past the Karman line.
• Virgin Galactic: Virgin Galactic is a private spaceflight company founded by Richard Branson that offers suborbital space tourism flights, taking paying passengers briefly above the Karman line region for a few minutes of weightlessness. It uses an air launched spaceplane system, with a carrier aircraft releasing the rocket powered SpaceShipTwo vehicle at altitude. It represents the commercialisation of space, a key theme in space policy, regulation and the emerging space economy. Example: Virgin Galactic's commercial flights carry tourists to about 80 to 90 km altitude, where they experience microgravity and view Earth's curvature before gliding back to a runway landing.
• Axiom Space: Axiom Space is a Houston-based American commercial spaceflight company founded in 2016 that operates private crewed missions to the International Space Station. It organises the Axiom Missions (Ax-1 through Ax-4) in partnership with NASA and SpaceX, flying government-sponsored and private astronauts aboard Crew Dragon spacecraft. The company is also building the Axiom Station, a planned commercial space station whose modules are intended to attach to the ISS before eventually operating independently. Example: Axiom Space's Axiom Mission 4 (June 2025) carried India's Shubhanshu Shukla to the ISS.
• Axiom-4: Axiom-4 (Ax-4) was the fourth private astronaut mission to the International Space Station organised by Axiom Space, flying in June and July 2025 aboard a SpaceX Crew Dragon launched from the Kennedy Space Center. The four-person crew was commanded by veteran astronaut Peggy Whitson and included astronauts from India, Poland and Hungary, marking the first government-sponsored human spaceflights for those countries in decades. For India, the mission was historic because Group Captain Shubhanshu Shukla became the first Indian to reach the ISS. Example: Axiom-4's crew spent about two weeks on the ISS conducting over 60 experiments, several proposed by Indian research institutions.
• Space Activities Act: The Space Activities Act would be India's first comprehensive legislation governing space activities, covering licensing of launches and satellites, liability for damage caused by space objects, insurance obligations, and compliance with international treaties like the Outer Space Treaty, 1967. A draft Space Activities Bill was first released for public comment in November 2017 but was never introduced in Parliament; a revised draft was finalised in May 2025 and is under inter-ministerial consultation, aiming to give statutory backing to IN-SPACe. Until it is enacted, private space activity is governed by policy instruments like the Indian Space Policy 2023. Example: The proposed licensing regime under the Bill that would make authorisation mandatory for private rocket launches from Indian soil.
• IN-SPACe: IN-SPACe, the Indian National Space Promotion and Authorisation Centre, is an autonomous single-window agency under the Department of Space, formed in June 2020 and headquartered at Ahmedabad. It promotes, authorises and supervises space activities of non-governmental entities, giving private players access to ISRO facilities and technology, while ISRO focuses on research and NSIL handles commercial operations. Example: IN-SPACe has received more than 150 applications from space non-governmental entities for authorisation, facilitation and promotion.
• Sriharikota: Sriharikota is a barrier island in Andhra Pradesh's Nellore district that hosts the Satish Dhawan Space Centre (SDSC SHAR), India's primary spaceport. Chosen for its location on the east coast near the equator, which gives rockets an eastward velocity boost and a safe flight path over the Bay of Bengal, it has two operational launch pads plus a third under construction. Nearly all Indian orbital launches, including PSLV, GSLV and LVM3 missions, lift off from here. Example: The Chandrayaan-3 launch aboard LVM3-M4 from Sriharikota on 14 July 2023.
• Space Vision 2047: Space Vision 2047 is the long-term roadmap for India's space programme, unveiled after a review chaired by the Prime Minister in October 2023, targeting India's emergence as a leading space power by the centenary of independence. Its headline milestones are the Bharatiya Antariksh Station (first module BAS-01 targeted for 2028, full station by 2035), an Indian crewed landing on the Moon by 2040, and missions like Chandrayaan-4, the Venus Orbiter and the Next Generation Launch Vehicle. It also envisions ISRO focusing on advanced R&D while private industry provides scale. Example: The Cabinet-approved plan to launch the first module of the Bharatiya Antariksh Station by 2028 as the first concrete step of the vision.
• Key takeaways: Key takeaways is a quick-revision summary box placed at the end of each article, listing the most exam-relevant points in a short numbered list. It distils definitions, dates, figures, provisions and examples into a form suited for last-minute revision before Prelims and Mains. Together with the article's practice questions, it turns every topic into a self-contained study unit.
• Indian Space Research Organisation (ISRO): India's national space agency, established on 15 August 1969 and headquartered in Bengaluru under the Department of Space, responsible for the country's civilian space programme. It designs and operates launch vehicles, application and communication satellites, and scientific and interplanetary missions. Example: ISRO's PSLV and GSLV rockets launch Indian and foreign satellites, and its Chandrayaan-3 mission achieved the first soft landing near the Moon's south pole in 2023.
• anti-satellite (ASAT): An anti-satellite weapon is a system designed to incapacitate, destroy or disrupt satellites in orbit, whether by kinetic kill vehicles, co-orbital interceptors, directed energy or electronic jamming. ASAT capabilities are significant for both warfare and deterrence, but kinetic tests create long-lived orbital debris, drawing international criticism. India demonstrated an ASAT capability in March 2019 through Mission Shakti, becoming the fourth country after the US, Russia and China to do so, using a modified ballistic missile defence interceptor against a low-orbit satellite. Example: India's Mission Shakti (2019) destroyed the Microsat-R satellite at about 300 km altitude, a test deliberately chosen in low orbit so debris would decay quickly.
• geostationary transfer orbit (GTO): A geostationary transfer orbit is a highly elliptical orbit used as a stepping stone between the initial launch orbit and the final geostationary orbit. The satellite is first placed into this elongated path, then its own engine fires at the highest point (apogee) to circularise the orbit at about 35,786 km above the equator. This two-step route is the standard, fuel-efficient way of delivering communication satellites to their final slot. Example: India's GSLV places satellites such as INSAT-3DR into GTO, after which the satellites raise themselves to geostationary orbit.
• Next-Generation Launch Vehicle (NGLV): ISRO's planned partially reusable heavy-lift launch vehicle, developed under the project name Soorya, intended to succeed the current fleet for the coming decades. The three-stage vehicle is designed to place about 30 tonnes in low-Earth orbit, with LOX-methane lower stages, a cryogenic upper stage and a first stage recovered through vertical landing, at a project outlay of roughly Rs 8,240 crore. Example: NGLV is the designated launcher for the Bharatiya Antariksh Station targeted by 2035 and India's planned crewed lunar landing by 2040.
• Non-Governmental Entities (NGEs): Private companies, startups and other non-state actors permitted to participate in India's space sector under the Indian Space Policy, 2023. NGEs can now undertake end-to-end space activities, from owning and operating satellites to building launch vehicles, running ground stations and selling space-based services, with authorisation and oversight from IN-SPACe, while ISRO concentrates on research, deep-space exploration and new technologies. Example: Private firms building small-satellite launch vehicles and operating earth-observation constellations work as NGEs under this framework.
• Kulasekarapattinam: Kulasekarapattinam is a coastal town in Thoothukudi district, Tamil Nadu, where ISRO is building its second spaceport, the SSLV Launch Complex, after the Satish Dhawan Space Centre at Sriharikota. Its southern coastal location allows direct southward launches over the Indian Ocean for polar orbits without fuel-wasting dogleg manoeuvres, and the complex is dedicated to Small Satellite Launch Vehicle missions for the growing commercial small-satellite market; the foundation stone was laid by the Prime Minister in February 2024. Example: The spaceport will support launches of satellites up to about 500 kg into low earth orbit, and IN-SPACe has invited private operators to manage the complex.

• The space economy is the full range of activities and the use of resources that create value and benefits for human beings in the course of exploring, researching, understanding, managing and utilising space; it was estimated at $613 billion globally in 2025.

• NVS-02 is the second of ISRO's new-generation navigation satellites, launched aboard GSLV-F15 in January 2025 on ISRO's 100th launch from the Satish Dhawan Space Centre.

• A rubidium atomic clock is an ultra-precise timekeeper that uses the natural vibration frequency of rubidium atoms to measure time; such clocks make metre-level satellite positioning possible.

• GNSS spoofing is an attack in which a transmitter broadcasts fake navigation signals that overpower genuine ones, making a receiver report a false position; the DGCA directed 10-minute reporting of suspected spoofing around Delhi airport in January 2026.

• The DGCA (Directorate General of Civil Aviation) is India's aviation safety regulator, which issued the January 2026 circular on reporting GNSS spoofing and jamming near Delhi airport.

• CE20 is India's indigenous cryogenic engine, powering the upper stage of the LVM3; it burns liquid hydrogen with liquid oxygen at a specific impulse of about 450 seconds.

• Specific impulse is the standard measure of rocket-engine efficiency: how much thrust an engine gets from each unit of propellant.

• A scramjet (supersonic combusting ramjet) is an air-breathing engine that burns fuel in supersonic airflow above Mach 6, drawing oxygen from the atmosphere instead of carrying oxidiser.

• The Artemis Accords are a US-led set of non-binding principles for responsible civil exploration of the Moon, Mars and beyond, launched in 2020; India signed in June 2023.

• Artemis II was the first crewed flight of NASA's Artemis programme, flying 1 to 10 April 2026 and setting the record for the farthest humans have travelled from Earth (252,756 miles).

• Gopi Thotakura is the pilot who flew aboard Blue Origin's NS-25 mission in May 2024, becoming the first Indian space tourist and the second Indian in space after Rakesh Sharma.

Prelims practice