Space Technology: ISRO Missions

ISRO's mission portfolio spans launch vehicles, satellites, and deep space exploration. Key missions: Chandrayaan (lunar: 1 orbiter, 2 failed landing, 3 success), Mangalyaan (Mars orbiter, 2014), Aditya-L1 (solar, 2023), AstroSat (astronomy), Gaganyaan (human spaceflight, 2024-25). Upcoming: NISAR (NASA-ISRO SAR, 2024), Venus Orbiter (Shukrayaan), Lunar Polar Exploration (LUPEX, JAXA). Technology: cryogenic (CE20), semi-cryogenic, reusable (RLV-TD), electric propulsion.[TOPIC CLASSIFICATION]

• Topic type: Science & Technology - ISRO Missions
• PYQ frequency: High
• Exam stage: Prelims + Mains
• Primary GS paper: GS 3

[EXAMINER REASONING]

1. Trap: Confusing Chandrayaan-2 and Chandrayaan-3 outcomes. Chandrayaan-2 (2019): orbiter success, Vikram lander crashed. Chandrayaan-3 (2023): orbiter + Vikram lander + Pragyan rover, successful south pole landing. Many aspirants conflate the two.
2. Most confused: Aditya-L1 vs Solar missions. Aditya-L1 is at Sun-Earth L1 point (1.5M km), studies solar corona with VELC (coronagraph) and SUIT (UV imager). It is NOT at L2 (that's JWST). Many aspirants confuse Lagrange points.
3. Key anchor: ISRO mission categories: Launch vehicles (PSLV, GSLV, LVM3, SSLV), Communication (GSAT, CMS), Navigation (NavIC), Earth Observation (Resourcesat, Cartosat, RISAT), Scientific (AstroSat, Aditya, Chandrayaan, Mangalyaan), Human Spaceflight (Gaganyaan). Upcoming: NISAR, Shukrayaan, LUPEX.
4. Current affairs hook: Chandrayaan-3 (Aug 2023, south pole landing, first). Aditya-L1 (Sep 2023, L1, VELC/SUIT). Gaganyaan: TV-D1 (2023), uncrewed 2024, crewed 2025. NISAR (NASA-ISRO, 2024). Gaganyaan TV-D1 (Oct 2023, abort test). RLV-TD (reusable).
5. Mains hinge: Evaluate: Has ISRO's shift to deep space exploration (Moon, Mars, Sun) come at the cost of societal applications? The balance between strategic prestige missions and developmental satellite services is the Mains frame.

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Core Concept

Lunar: Chandrayaan-1 (2008, orbiter, water ice discovery). Chandrayaan-2 (2019, orbiter success, lander crash). Chandrayaan-3 (Aug 2023, successful south pole landing, Vikram lander + Pragyan rover, first at south pole). LUPEX (JAXA-ISRO, lunar polar exploration, 2025+).

Mars: Mangalyaan / MOM (2014, Mars orbiter, first Asian nation, $74M). MOM-2 planned.

Solar: Aditya-L1 (Sep 2023, L1 point 1.5M km, VELC coronagraph, SUIT UV imager, studies corona, CME, solar wind).

Astronomy: AstroSat (2015, multi-wavelength: UV, X-ray, first Indian space observatory).

Human Spaceflight: Gaganyaan (3 crew, 400km LEO, 3 days). TV-D1 (Oct 2023, abort test success). Uncrewed 2024, crewed 2025. LVM3 human-rated. Vyommitra (humanoid).

Earth Observation: EOS series, RISAT (SAR), Cartosat, Resourcesat, Oceansat.