ISRO: From Vision to Global Leadership
The Indian Space Research Organisation (ISRO) was established on 15 August 1969, with Dr Vikram Sarabhai as its founding visionary. Beginning from borrowed church facilities in Thiruvananthapuram with a small team, ISRO has transformed India from a space programme that rented launch vehicles from the Soviet Union to an organisation that builds its own rockets, satellites, and interplanetary spacecraft. ISRO's headquarters is in Bengaluru. The Satish Dhawan Space Centre (SDSC SHAR) at Sriharikota, Andhra Pradesh, is India's only spaceport. ISRO is governed by the Department of Space, which reports directly to the Prime Minister.
Chandrayaan-3: India Makes History on the Moon
On 23 August 2023, the Vikram lander of Chandrayaan-3 successfully soft-landed near the lunar south pole at approximately 69 degrees south latitude. This made India the first country in the world to successfully land near the lunar south pole and the fourth country overall (after the Soviet Union, USA and China) to achieve a soft lunar landing. Prime Minister Narendra Modi named the landing site Shiv Shakti Point on 26 August 2023. The Chandrayaan-2 crash site (2019) was simultaneously named Tiranga Point.
The Pragyan rover, deployed from Vikram, operated for approximately 14 days (one lunar day) and made landmark scientific findings. Using its LIBS (laser-induced breakdown spectroscopy) and APXS (alpha particle X-ray spectrometer) instruments, Pragyan confirmed the presence of sulphur, oxygen, iron, aluminium, silicon, calcium, titanium, chromium and manganese in the lunar south pole regolith. The detection of sulphur at the south pole was a scientifically significant and unexpected finding with implications for understanding lunar formation.
Chandrayaan-3 used the LVM3 launch vehicle and cost approximately Rs 615 crore — a fraction of comparable international missions. This cost efficiency is itself a globally recognised competitive advantage of the Indian space programme.
Founded: 15 August 1969 | HQ: Bengaluru | Chairman (2024+): S. Somanath | Spaceport: SDSC SHAR, Sriharikota, Andhra Pradesh | Lunar landing site named: Shiv Shakti Point | Chandrayaan-3 cost: ~Rs 615 crore
SpaDeX: India Masters Space Docking Technology
Space Docking Experiment (SpaDeX) was launched in December 2024 and demonstrated successful in-orbit docking in early 2025, making India the fourth country to master space docking technology after the United States, Russia and China. Space docking — the joining of two independently flying spacecraft in orbit — is a fundamental capability required for assembling space stations, transferring crew, enabling multi-launch deep-space missions and executing lunar sample return architectures.
SpaDeX used two small spacecraft: SDX01 (the Chaser) and SDX02 (the Target), launched together on a PSLV. After separation, SDX01 performed orbital manoeuvres to close in on SDX02, execute docking, and test power transfer between the docked spacecraft. This technology demonstration was a critical prerequisite for Chandrayaan-4, which requires orbital docking above the Moon.
Chandrayaan-4: India Aims for Lunar Sample Return
Chandrayaan-4 is India's most ambitious lunar mission to date, targeting the collection of lunar soil samples and return to Earth — an achievement accomplished by only three programmes previously: the USA (Apollo missions), the Soviet Union (Luna programme) and China (Chang'e-5 in 2020 and Chang'e-6 in 2024).
The mission architecture is complex. It requires two separate launches: one for the Propulsion Module + Descender, and one for the Ascender + Transfer/Re-entry Module. The Ascender lands on the Moon (within the Descender), collects samples, launches from the lunar surface, and docks with the Transfer Module in lunar orbit. The Re-entry Capsule then returns the samples to Earth for scientific analysis. This architecture directly required the SpaDeX docking demonstration. Chandrayaan-4 is targeted for the 2027-2028 timeframe.
Gaganyaan: India's Crewed Spaceflight Programme
Gaganyaan is India's human spaceflight programme, aiming to send Vyomanauts (India's term for astronauts) to a 400 km low Earth orbit for a 3-day mission. Approved in 2018 with a budget of Rs 9,023 crore, the programme has made steady progress through qualification tests and unmanned demonstration missions. Four Indian Air Force fighter pilots have been selected as Vyomanauts: Group Captain Prashanth Balakrishnan Nair, Group Captain Ajit Krishnan, Group Captain Angad Pratap and Wing Commander Shubhanshu Shukla.
Wing Commander Shukla made history in 2025 by flying to the International Space Station as part of the Axiom Space AX-4 commercial mission, becoming the second Indian in space (after Rakesh Sharma in 1984) and gaining direct spaceflight experience ahead of Gaganyaan. The Gaganyaan Crew Escape System has been successfully tested. If the crewed mission succeeds, India becomes the fourth country to independently send humans to space after the Soviet Union/Russia, USA and China. First crewed mission is targeted for 2026.
Aditya-L1: India's Solar Observatory
Aditya-L1 was launched on 2 September 2023 and reached Lagrange Point 1 (L1) of the Sun-Earth system on 6 January 2024. L1 is a gravitational equilibrium point approximately 1.5 million km from Earth, where a spacecraft orbits the Sun at the same rate as Earth, allowing continuous solar observation without eclipse interruptions.
Aditya-L1 carries seven scientific payloads studying the solar corona, solar wind, solar flares, and coronal mass ejections (CMEs). CMEs are enormous bursts of magnetised plasma from the Sun that, when Earth-directed, can disrupt satellite communications, GPS systems, power grids and aviation. Better CME understanding enables improved space weather forecasting, protecting critical infrastructure.
XPoSat and NISAR: India's Recent Milestones
XPoSat (X-Ray Polarimeter Satellite), launched 1 January 2024, studies X-ray polarisation from bright cosmic sources including pulsars, neutron stars and black holes. India became only the second country after the USA (IXPE mission, 2021) to deploy a dedicated X-ray polarimetry satellite. X-ray polarimetry provides unique insights into the geometry of extreme astrophysical environments that other observations cannot.
NISAR (NASA-ISRO Synthetic Aperture Radar) is a joint Earth observation satellite valued at approximately USD 1.5 billion. It uses dual-frequency SAR (L-band from NASA, S-band from ISRO) to measure Earth surface deformations at millimetre precision. Applications include glacial retreat monitoring, earthquake mapping, forest biomass assessment, agricultural monitoring and urban subsidence detection.
India Space Policy 2023 and the Private Sector
India's Space Policy 2023 formally opened the space sector to private participation. Key provisions: ISRO focuses on R&D, national security missions and deep-space exploration. New Space India Limited (NSIL) manages commercial activities including launch services. IN-SPACe (Indian National Space Promotion and Authorisation Centre) regulates, promotes and authorises private space activities. By 2026, over 150 private space startups are registered under IN-SPACe.
Notable private space milestones: Skyroot Aerospace launched Vikram-S in November 2022 (India's first private rocket to reach space). Agnikul Cosmos tested Agnibaan with the world's first single-piece 3D-printed rocket engine. The sector is growing rapidly, promising to make India a competitive global space manufacturing and launch services hub.
ISRO Launch Vehicle Summary Table
| Vehicle | LEO Payload | Key Missions |
|---|---|---|
| PSLV | 3,800 kg | Chandrayaan-1, Mars Orbiter Mission, Aditya-L1, AstroSat |
| GSLV Mk II | 5,000 kg | Communication satellites, GSAT series |
| LVM3 (GSLV Mk III) | 8,000 kg | Chandrayaan-2 & 3, Gaganyaan, OneWeb commercial missions |
| SSLV | 500 kg | Earth observation microsatellites |
| NGLV (in development) | 30,000 kg | Future crewed missions and space station assembly |