EARTH AND SPACE
SUMMARY
1. A Space 2025 Rendezvous: Why the Next Year Matters
- 2025 marked as a convergence year for major global space milestones.
- Shift from episodic missions to continuous, competitive space ecosystem.
- Renewed emphasis on crewed missions and lunar programmes.
- Heavy-lift rockets and reusable launch systems increasing launch cadence.
- Private companies now central to launch frequency and satellite constellations.
- Space activity linked to geopolitics, commercial expansion, and national security.
- Transition from symbolic exploration to sustained capability-building.
2. India in the Global Space Calendar: Momentum and Signalling
- India moving from application-focused programme to strategic capability expansion.
- Emphasis on indigenous launch vehicles and technological sovereignty.
- Human spaceflight as symbol of technological maturity.
- Importance of repeatable launch cadence over one-time milestones.
- Expansion of private space startups and industrial ecosystem.
- Space linked to communications, disaster management, navigation, and climate services.
- Sustainability and continuity define long-term credibility.
3. Stars, Galaxies, and Black Holes: The Cosmic Puzzle
- Universe composed largely of dark matter and dark energy.
- Galaxy rotation curves indicate unseen mass.
- Accelerating universe suggests dark energy.
- Gravitational lensing and cosmic microwave background support models.
- Black holes test limits of relativity and gravity.
- Gravitational waves confirm black hole mergers.
- Astronomy relies on indirect but consistent observational evidence.
4. The Solar System: A Structured Family Around the Sun
- Sun as gravitational anchor and energy source.
- Inner rocky planets vs outer gas/ice giants.
- Asteroid belt separates terrestrial and giant planets.
- Diversity of atmospheres, rings, and moons.
- Orbital mechanics govern space travel.
- Scale of distances crucial for mission planning.
- Solar System formation shaped planetary evolution pathways.
5. Planets at a Glance: What Makes Each World Unique
- Earth habitable due to atmosphere, water, magnetic field, tectonics.
- Venus shows runaway greenhouse effect.
- Mars demonstrates atmospheric loss and cooling.
- Gas giants dominated by hydrogen and helium.
- Ice giants rich in methane and volatile compounds.
- Planetary systems shaped by size, gravity, and composition.
- Habitability depends on interacting systems, not single factor.
6. Asteroids: Small Bodies With Big Consequences
- Leftovers from Solar System formation.
- Contain primitive material and possible water sources.
- Near-Earth Objects (NEOs) pose impact risk.
- Monitoring through telescopes and orbital tracking.
- Planetary defence requires prediction and deflection research.
- Potential future resource for mining.
- Astronomy contributes to global safety planning.
7. Exoplanets: What Lies Beyond Our Solar System
- Thousands of planets discovered around other stars.
- Transit and radial velocity methods detect planets indirectly.
- Research shifting from detection to atmospheric characterization.
- Diversity includes hot Jupiters, super-Earths, multi-planet systems.
- Habitability requires atmospheric and chemical context.
- Expands search for extraterrestrial life.
- Demonstrates power of indirect scientific inference.
8. Human Flight and Space Exploration: Timeline of Milestones
- Progression: rocketry → orbit → human flight → docking → space stations.
- Moon landing as high-integration achievement.
- Robotic probes expanded deep-space knowledge.
- Reliability and repetition as key capability markers.
- Life-support and re-entry systems critical.
- Space capability built cumulatively over decades.
9. Earth as a Planet: A Living System
- Liquid water central to habitability.
- Atmosphere regulates temperature and blocks radiation.
- Plate tectonics recycle carbon and shape landforms.
- Internal and external energy sources interact.
- Hydrological cycle drives climate regulation.
- Magnetic field shields from solar radiation.
- Earth functions as integrated dynamic system.
10. Atmospheric Disturbances
- Caused by pressure, temperature, humidity differences.
- Tropical cyclones fuelled by warm oceans.
- Mid-latitude cyclones driven by temperature contrasts.
- Severe storms linked to instability and wind shear.
- Direct connection to disaster risk and governance.
- Forecasting crucial for preparedness.
11. Earthquakes: Measuring and Preparing
- Caused by tectonic stress release.
- Magnitude measures energy; intensity measures impact.
- Damage depends on depth, geology, and b