Space Technology has become a highly important and scoring area in the UPSC Prelims due to India’s growing capabilities and global developments. Questions are generally conceptual + current affairs based.
1. Basics of Space Technology
Start with fundamental concepts to build a strong base:
- What is Space Technology?
- Orbit types:
- Low Earth Orbit (LEO)
- Medium Earth Orbit (MEO)
- Geostationary Orbit (GEO)
- Sun-synchronous orbit
- Escape velocity
- Orbital velocity
- Kepler’s laws of planetary motion
- Launch windows
👉 Focus: Conceptual clarity—UPSC often asks application-based questions.
2. ISRO and Its Missions
India’s space programme led by Indian Space Research Organisation is extremely important.
Key Missions to Prepare:
- Chandrayaan-1 – Discovery of water on Moon
- Chandrayaan-2 – Orbiter success
- Chandrayaan-3 – Soft landing achievement
- Mars Orbiter Mission – Cost-effective Mars mission
- Gaganyaan – Upcoming crewed mission
- Aditya-L1 – Study of Sun
Important Aspects:
- Objectives of missions
- Launch vehicles used
- Achievements and outcomes
- International collaborations
3. Types of Satellites
Understand classification and applications:
Based on Function:
- Communication satellites
- Weather satellites
- Navigation satellites
- Remote sensing satellites
- Scientific satellites
Key Concepts:
- Transponders
- Payload vs bus
- Satellite lifespan
- Polar vs geostationary satellites
👉 Link with real examples from ISRO missions.
4. Launch Vehicles: PSLV vs GSLV
Comparison is frequently asked.
PSLV (Polar Satellite Launch Vehicle)
- Used for placing satellites in polar orbit
- Highly reliable
- Used for interplanetary missions
GSLV (Geosynchronous Satellite Launch Vehicle)
- Used for heavier payloads
- Places satellites in geostationary orbit
- Uses cryogenic engine
👉 Focus Areas:
- Differences in stages
- Payload capacity
- Use cases
5. Cryogenic Engine
A very important conceptual topic.
Key Points:
- Uses liquid hydrogen and liquid oxygen
- Works at extremely low temperatures
- Higher efficiency than solid/liquid engines
Importance:
- Essential for heavy satellite launches
- Technology mastered by India after long effort
👉 UPSC may ask:
- Why cryogenic engines are more efficient
- Challenges in development
6. Navigation Systems (NavIC)
India’s regional navigation system:
- NavIC
Key Features:
- Regional coverage (India + surrounding region)
- Provides accurate positioning
- Civilian and military applications
Comparison:
- GPS (USA)
- GLONASS (Russia)
- Galileo (EU)
👉 Focus: Differences, accuracy, coverage.
7. Space Exploration Programmes
Both Indian and global programmes are important.
Indian Programme:
- Lunar exploration (Chandrayaan series)
- Solar exploration (Aditya-L1)
- Human spaceflight (Gaganyaan)
Global Programmes:
- NASA missions
- Artemis Program
- SpaceX reusable rockets
- European Space Agency missions
👉 Focus:
- International collaboration
- Private sector role
- Future missions
8. Remote Sensing and Applications
Important for Geography + Science overlap:
- Electromagnetic spectrum basics
- Types: Active vs passive sensing
- Applications:
- Agriculture
- Disaster management
- Urban planning
- Climate monitoring
9. Space Applications in Daily Life
UPSC often frames applied questions:
- Communication (TV, internet)
- Weather forecasting
- GPS and navigation
- Defence applications
- Disaster warning systems
10. Space Debris and Challenges
Emerging topic in current affairs:
- What is space debris?
- Kessler Syndrome
- Anti-satellite tests (ASAT)
- Space traffic management
11. International Space Treaties & Governance
- Outer Space Treaty (1967)
- Liability Convention
- Moon Agreement
👉 Focus: Peaceful use of outer space.
12. Current Affairs Linkage (Very Important)
Always connect static topics with recent developments:
- New ISRO launches
- Private space startups in India
- Global missions (Moon, Mars, Sun)
- Defence space developments
Preparation Strategy for Prelims
- Focus on concepts + current affairs integration
- Revise ISRO missions repeatedly
- Practice previous year questions (PYQs)
- Follow government sources like PIB and ISRO updates
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