Science & Technology
Space and Defence Technology
Space Exploration and Human Spaceflight: Chandrayaan to Gaganyaan
Chandrayaan-1/2/3, Mangalyaan, AstroSat, Aditya-L1, XPoSat, SpaDeX, Gaganyaan, Ax-4 and the Bharatiya Antariksh Station — mission status as of 2026.
Prerequisites
- Indian Space Programme: Evolution, Institutions and Launch Vehicles — PSLV vs LVM3 and the idea of orbits.
- Satellites and Their Applications — how earlier satellites built the base for exploration.
The Hook: 23 August, National Space Day
Connect
On the evening of 23 August 2023, classrooms across Chhattisgarh — from Raipur’s government schools to ashram schools in Bastar — watched a live stream as Chandrayaan-3’s Vikram lander touched down near the Moon’s south pole. India made 23 August its National Space Day (राष्ट्रीय अंतरिक्ष दिवस), first observed in 2024.
Four years earlier, Chandrayaan-2’s lander had crashed. What changed, and what comes next — a sample-return mission, an Indian in orbit, an Indian space station? This page gives you each mission’s facts and, where a mission is still ahead, its status as of 2026.
Why it matters: “First country to…”, “which mission studied…” and “launched by which vehicle” are standard Prelims MCQs. Mains asks you to justify these missions for a developing country.
Mission Map at a Glance
timeline title India beyond Earth orbit (launch years) 2008 : Chandrayaan-1 (PSLV) 2013 : Mars Orbiter Mission (PSLV) 2015 : AstroSat (PSLV) 2019 : Chandrayaan-2 (LVM3) 2023 : Chandrayaan-3 (LVM3) : Aditya-L1 (PSLV) 2024 : XPoSat (PSLV) : SpaDeX (PSLV) 2025 : Shubhanshu Shukla on ISS (Ax-4) 2026-28 : Gaganyaan G1 uncrewed (pending) : Chandrayaan-4 : BAS-1 module
Moon Missions: Chandrayaan (चंद्रयान)
| Mission | Launch | Vehicle | Key facts |
|---|---|---|---|
| Chandrayaan-1 | 22 Oct 2008 | PSLV-C11 | Orbiter + Moon Impact Probe (struck near the south pole). Its instruments, including NASA’s Moon Mineralogy Mapper (M3), helped confirm water/hydroxyl molecules on the lunar surface. Contact lost in Aug 2009 |
| Chandrayaan-2 | 22 Jul 2019 | LVM3-M1 | Orbiter + Vikram lander + Pragyan rover. Lander crash-landed on 7 Sep 2019 (software/guidance issue in the final descent). The orbiter continues to work and later served as a communication relay for Chandrayaan-3 |
| Chandrayaan-3 | 14 Jul 2023 | LVM3-M4 | Soft landing on 23 Aug 2023 near the lunar south pole (about 69° S). Lander + rover only; a propulsion module carried them to lunar orbit |
Chandrayaan-3 — the facts examiners use
- India became the fourth country to soft-land on the Moon (after the USSR, USA and China) and the first to land near the south pole.
- The landing site was named “Shiv Shakti Point”; Chandrayaan-2’s crash site was named “Tiranga Point”.
- Pragyan confirmed sulphur in the lunar soil near the pole using its laser-induced breakdown spectroscope (LIBS), and the lander’s ChaSTE probe measured the temperature profile of the topsoil.
- Vikram “hopped” — it lifted off and landed again about 30–40 cm away — testing technology for future sample return.
- The propulsion module was later brought back from lunar orbit to an Earth orbit, another technology test.
- Changes from Chandrayaan-2: a larger landing zone, stronger legs, more fuel and a “failure-based” design that assumed things would go wrong.
What comes next (status as of 2026)
| Mission | Status |
|---|---|
| Chandrayaan-4 | Approved by the Union Cabinet on 18 Sep 2024 (about ₹2,104 crore). A lunar sample-return mission: modules launched separately, joined in orbit, with samples brought back to Earth. Launch reported as targeted for 2027 |
| Chandrayaan-5 / LUPEX | Joint ISRO–JAXA (Japan) lunar polar exploration mission. The implementing arrangement was signed on 29 Aug 2025 during the PM’s visit to Tokyo. JAXA’s H3 rocket is to carry an ISRO lander and a Japanese rover to study water-ice near the south pole |
| Indian on the Moon | National vision of landing an Indian on the Moon by 2040 |
Mars, Venus, the Sun and the Stars
| Mission | Launch | Key facts |
|---|---|---|
| Mars Orbiter Mission (Mangalyaan, मंगलयान) | 5 Nov 2013, PSLV-C25 | Entered Mars orbit on 24 Sep 2014. India became the first Asian nation to reach Mars orbit and the first country to do so on its maiden attempt. Low cost (about ₹450 crore). Planned for six months, it worked for about eight years; contact was lost in 2022 |
| AstroSat | 28 Sep 2015, PSLV-C30 | India’s first dedicated multi-wavelength space observatory (UV, optical, X-ray) |
| Aditya-L1 | 2 Sep 2023, PSLV-C57 | India’s first space-based solar mission. Placed in a halo orbit around Lagrange point L1 (~1.5 million km from Earth) on 6 Jan 2024. Seven payloads; the main one, VELC (Visible Emission Line Coronagraph), studies the corona and coronal mass ejections |
| XPoSat | 1 Jan 2024, PSLV-C58 | India’s first X-ray polarimetry satellite, studying black holes and neutron stars — the world’s second such mission after NASA’s IXPE (2021) |
| Venus Orbiter Mission (Shukrayaan) | Approved Sep 2024 (₹1,236 crore) | To study Venus’s surface, atmosphere and its interaction with the Sun; launch planned around March 2028 |
Why L1?
At a Lagrange point, the gravity of the Sun and Earth balances the centripetal force needed for a small object to move in step with Earth. A satellite near L1 stays between Earth and the Sun and can watch the Sun without eclipses or occultation. NASA–ESA’s SOHO also works from L1.
SpaDeX: Learning to Dock
| Point | Detail |
|---|---|
| Full name | Space Docking Experiment |
| Launch | 30 Dec 2024, PSLV-C60 — two small satellites, SDX01 (“Chaser”) and SDX02 (“Target”) |
| Docking | 16 Jan 2025 — India became the fourth country to dock two spacecraft in orbit, after the USA, Russia and China |
| Undocking | March 2025 |
| Why it matters | Docking is essential for Chandrayaan-4 (modules joined in orbit), the Bharatiya Antariksh Station and crew transfer |
Human Spaceflight: Gaganyaan (गगनयान)
The programme
| Point | Detail |
|---|---|
| Announced | 15 Aug 2018 (Independence Day speech) |
| Aim | Send a crew of up to 3 to a ~400 km low Earth orbit for up to 3 days and return them safely to a sea splashdown |
| Rocket | Human-rated LVM3 (HLVM3) |
| Spacecraft | Crew Module (pressurised, Indian-built) + Service Module (propulsion and power) |
| Lead centre | Human Space Flight Centre (HSFC), Bengaluru |
| Robot | Vyommitra, a half-humanoid robot, to fly on the uncrewed missions |
| Key tests done | TV-D1 (21 Oct 2023) tested the crew escape system; integrated parachute air-drop tests (from 2025); thousands of ground tests |
| Astronaut-designates (named 27 Feb 2024) | Indian Air Force officers Prasanth Balakrishnan Nair, Ajit Krishnan, Angad Pratap and Shubhanshu Shukla — trained partly in Russia and in India |
| Expanded scope (Sep 2024) | Programme revised to eight missions by December 2028 (including the first BAS module); total outlay about ₹20,193 crore |
Status as of 2026
Where Gaganyaan stands (as of early October 2026)
- The first uncrewed flight, G1 (with Vyommitra), had not yet flown. ISRO Chairman V. Narayanan said through mid-2026 that ISRO was working towards launching G1 by the end of 2026, after earlier targets slipped.
- Two more uncrewed flights are planned after G1. The first crewed flight is expected no earlier than 2027, depending on the uncrewed results.
- Answer-writing tip: write “planned”, never “launched”, for G1 and the crewed flight unless you have seen news of the launch.
Shubhanshu Shukla and Axiom Mission 4 (Ax-4)
- Group Captain Shubhanshu Shukla (from Lucknow), one of the four Gaganyaan astronaut-designates, flew as pilot of the commercial Axiom Mission 4.
- Launch 25 Jun 2025 on a SpaceX Falcon 9 / Crew Dragon from Florida; docked with the International Space Station (ISS) on 26 Jun; splashdown on 15 Jul 2025.
- He became the first Indian to visit the ISS and the second Indian in space, 41 years after Rakesh Sharma (1984).
- The ISRO-sponsored flight gave hands-on experience for Gaganyaan; his crew ran microgravity experiments, including Indian ones.
Bharatiya Antariksh Station (BAS, भारतीय अंतरिक्ष स्टेशन)
| Point | Plan (as of 2026) |
|---|---|
| First module (BAS-1) | Approved Sep 2024 as part of the expanded Gaganyaan programme; targeted for 2028 |
| Full station | Operational by 2035 |
| Rocket for heavier modules | NGLV (Next Generation Launch Vehicle), approved Sep 2024 |
| Model shown | A BAS-1 model was displayed on National Space Day, Aug 2025 |
India's space vision ladder
2026–27: Gaganyaan uncrewed then crewed → 2027: Chandrayaan-4 sample return (target) → 2028: BAS-1 module, Venus Orbiter → 2035: full Bharatiya Antariksh Station → 2040: Indian on the Moon.
Memory Tricks
Chandrayaan in one line each
- 1 = Water (orbiter + impact probe, 2008)
- 2 = Wreck (lander crashed, orbiter survives, 2019)
- 3 = Win (south-pole soft landing, 23 Aug 2023)
- 4 = Return (sample return, target 2027)
- 5 = Japan (LUPEX with JAXA)
Fourth-country club
India was fourth in three things: soft Moon landing (2023), space docking (2025) and anti-satellite test (2019, see Missiles). In each case the first three were the USA, Russia/USSR and China.
'Aditya at L1, XPoSat on New Year'
Aditya-L1 launched 2 Sep 2023 and reached L1 on 6 Jan 2024; XPoSat launched on 1 Jan 2024 — ISRO’s New Year launch.
Don’t Confuse
| This | vs | That |
|---|---|---|
| Chandrayaan-1 — orbiter + impact probe, no soft landing | vs | Chandrayaan-3 — soft landing + rover, no orbiter of its own |
| Shiv Shakti Point — Chandrayaan-3 landing site | vs | Tiranga Point — Chandrayaan-2 crash site |
| Rakesh Sharma (1984) — Soviet Soyuz, Salyut-7 station | vs | Shubhanshu Shukla (2025) — Axiom-4, ISS |
| Aditya-L1 — Sun, from L1 | vs | XPoSat — X-ray polarisation from cosmic sources |
| Gaganyaan G1 — uncrewed test (pending as of 2026) | vs | TV-D1 — 2023 crew-escape test flight, not an orbital mission |
Common Mistakes
MCQ traps
- “Chandrayaan-3 carried an orbiter.” False. It had a lander, rover and propulsion module; it used Chandrayaan-2’s orbiter as a relay.
- “India was the first country to soft-land on the Moon’s far side / at the south pole itself.” The accurate claim is first to land near the south polar region (about 69° S). China’s Chang’e-4 (2019) was the first on the far side.
- “Mangalyaan made India the first country to reach Mars.” False. It made India the first to reach Mars orbit on the first attempt and the first Asian nation to do so.
- “Gaganyaan sent Indian astronauts to space in 2025.” False. The 2025 flight was Axiom-4 (commercial, to the ISS). Gaganyaan’s crewed flight is still ahead (as of 2026).
- “Aditya-L1 orbits the Sun at L1, 1.5 million km from the Sun.” False. L1 is about 1.5 million km from Earth, towards the Sun.
Practice
All questions below are original practice questions written in CGPSC style. They are not previous-year questions.
Level 1: Foundation
- Chandrayaan-3’s landing site is called ______ Point.
- Aditya-L1 is placed in a halo orbit around Lagrange point ______.
- The first Indian to visit the International Space Station was ______.
Answers
- Shiv Shakti Point.
- L1.
- Shubhanshu Shukla (Axiom-4, June–July 2025).
Level 2: Prelims MCQs
Q1. Consider the following statements:
- Chandrayaan-3 was launched by the PSLV.
- India’s SpaDeX mission made it the fourth country to dock two spacecraft in orbit.
- Mars Orbiter Mission reached Mars orbit on India’s first attempt.
Which of the statements given above is/are correct?
- (a) 1 and 2 only
- (b) 2 and 3 only
- (c) 3 only
- (d) 1, 2 and 3
Answer and explanation
(b) 2 and 3 only. Chandrayaan-3 was launched by LVM3-M4, not PSLV. SpaDeX docked on 16 Jan 2025, after the USA, Russia and China. Mangalyaan reached Mars orbit on 24 Sep 2014 at the first attempt.
Q2. Match List I (Mission) with List II (Objective):
| List I | List II |
|---|---|
| A. Aditya-L1 | 1. Lunar sample return |
| B. XPoSat | 2. Study of the solar corona |
| C. Chandrayaan-4 | 3. Polarisation of cosmic X-rays |
| D. LUPEX | 4. ISRO–JAXA lunar polar exploration |
- (a) A-2, B-3, C-4, D-1
- (b) A-2, B-3, C-1, D-4
- (c) A-3, B-2, C-1, D-4
- (d) A-1, B-3, C-2, D-4
Answer and explanation
(b) A-2, B-3, C-1, D-4. Aditya-L1 studies the Sun’s corona (VELC); XPoSat measures X-ray polarisation; Chandrayaan-4 is the planned sample-return mission; LUPEX (Chandrayaan-5) is the joint mission with Japan’s JAXA.
Q3. Which of the following was not among the findings or demonstrations of Chandrayaan-3?
- (a) Confirmation of sulphur near the lunar south pole
- (b) A “hop” of the Vikram lander
- (c) Return of lunar soil samples to Earth
- (d) Temperature profile of the lunar topsoil
Answer and explanation
(c). Chandrayaan-3 did not return samples — that is the goal of Chandrayaan-4. Pragyan’s LIBS confirmed sulphur, ChaSTE measured soil temperature, and Vikram’s hop tested re-lift technology.
Q4. With reference to the Gaganyaan programme (as of 2026), which one of the following statements is correct?
- (a) Its first crewed flight took place in 2025.
- (b) It uses the human-rated LVM3 and a crew module designed for up to three astronauts.
- (c) Vyommitra is the name of its crew module.
- (d) The crew module will splash down in the Arabian Sea only after a lunar flyby.
Answer and explanation
(b). Gaganyaan uses the human-rated LVM3 (HLVM3) and a crew module for up to three people in a ~400 km orbit. No crewed flight had taken place as of 2026; Vyommitra is the robot to fly on uncrewed tests; the mission is to low Earth orbit, not the Moon.
Q5. India’s first dedicated multi-wavelength space observatory is:
- (a) Aditya-L1
- (b) AstroSat
- (c) XPoSat
- (d) NISAR
Answer and explanation
(b) AstroSat, launched on PSLV-C30 on 28 Sep 2015. It observes in ultraviolet, optical and X-ray bands at the same time.
Level 3: Mains Answer Writing
Q1. (150–200 words) Explain the significance of Chandrayaan-3 for India’s science, technology and global standing.
Model answer outline
- Intro: Soft landing near the lunar south pole on 23 Aug 2023 — fourth nation to soft-land, first near the south pole.
- Science: sulphur detection, topsoil temperature profile, seismic and plasma data; the south pole’s possible water-ice is a resource for future bases.
- Technology: recovery from the Chandrayaan-2 failure through “failure-based design”; hop experiment and propulsion module return — stepping stones to sample return (Chandrayaan-4) and docking (SpaDeX).
- Economy and diplomacy: low cost; credibility for commercial launches (NSIL) and partnerships (LUPEX with JAXA; Artemis Accords, which India signed in 2023).
- Society: National Space Day (23 Aug); inspired students across the country, including government-school students in Chhattisgarh who watched it live.
- Conclusion: A national confidence moment that moved India from a follower to a peer in lunar exploration.
Q2. (150–200 words) What is the Gaganyaan programme? Discuss its challenges and benefits.
Model answer outline
- Intro: India’s first human spaceflight programme (announced 2018): up to 3 crew, ~400 km orbit, up to 3 days, HLVM3.
- Progress (as of 2026): crew-escape test TV-D1 (2023), air-drop tests, four astronaut-designates (2024), Shukla’s Ax-4 experience (2025); uncrewed G1 targeted by end-2026.
- Challenges: human-rating every system; life support, crew escape and re-entry heat shield; repeated schedule slips; cost (≈₹20,193 crore for the expanded programme); recent PSLV failures underline quality demands.
- Benefits: a path to the Bharatiya Antariksh Station (2035) and Moon landing (2040); spin-offs in materials, medicine and life-support; industry participation; strategic prestige.
- Conclusion: Slow and safe is right — a crewed failure would set the programme back years.
Quick Revision Table
| Fact | Detail |
|---|---|
| Chandrayaan-1 | 22 Oct 2008, PSLV-C11; water/hydroxyl evidence; Moon Impact Probe |
| Chandrayaan-2 | 22 Jul 2019, LVM3; lander crashed 7 Sep 2019; orbiter works |
| Chandrayaan-3 | 14 Jul 2023, LVM3-M4; landed 23 Aug 2023, ~69° S; Shiv Shakti Point |
| National Space Day | 23 August (from 2024) |
| Chandrayaan-4 | Sample return; approved Sep 2024; target 2027 |
| Chandrayaan-5 / LUPEX | ISRO–JAXA; arrangement signed 29 Aug 2025; JAXA H3 rocket |
| Mangalyaan | Launched 5 Nov 2013; Mars orbit 24 Sep 2014; contact lost 2022 |
| AstroSat | 28 Sep 2015; first multi-wavelength observatory |
| Aditya-L1 | 2 Sep 2023, PSLV-C57; L1 halo orbit 6 Jan 2024; 7 payloads, VELC |
| XPoSat | 1 Jan 2024, PSLV-C58; X-ray polarimetry |
| SpaDeX | 30 Dec 2024 launch; docked 16 Jan 2025; 4th country |
| Venus Orbiter | Approved Sep 2024; ~March 2028 |
| Gaganyaan | Announced 2018; 3 crew, ~400 km, 3 days; G1 uncrewed pending (as of Oct 2026) |
| Astronaut-designates | Nair, Krishnan, Angad Pratap, Shukla (27 Feb 2024) |
| Ax-4 | Shukla on ISS; 25 Jun–15 Jul 2025 |
| BAS | BAS-1 module 2028; full station 2035 |
Key Takeaways
Key Takeaways
- Chandrayaan-3 (23 Aug 2023) made India the fourth to soft-land on the Moon and the first near its south pole.
- Mangalyaan, AstroSat, Aditya-L1 and XPoSat show a broad, low-cost science programme — mostly on PSLV.
- SpaDeX (Jan 2025) gave India docking capability, the key to Chandrayaan-4 and the space station.
- Gaganyaan is still in its uncrewed-test phase as of 2026; Shubhanshu Shukla (Ax-4, 2025) is the first Indian on the ISS.
- The roadmap: BAS-1 (2028) → BAS (2035) → Indian on the Moon (2040) — always write future missions as “planned”.
What’s Next
- Missiles and Strategic Systems — the defence side of rocket technology, including the 2019 ASAT test
- Space and Defence Technology — Quick Revision — every mission date on one page
- International Organisations and Events — global partnerships such as NASA, JAXA and the Artemis Accords
- Physics in Everyday Life — gravity, orbits and the physics behind Lagrange points
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