- Space missions are of two types: launching satellites around Earth and exploring space objects beyond Earth.
- Yuri Gagarin was the first human in space (1961), and Neil Armstrong was the first on the Moon (1969).
- Indian space explorers include Rakesh Sharma, Kalpana Chawla, and Sunita Williams.
- Space technology enables fast global communication, internet access, and early warning of natural disasters.
- Satellites support defence, surveillance, weather forecasting, and the location of natural resources, making space tech vital for national development.
Key Points
Key Points: Satellite Launch Vehicles
- Satellite launch vehicles work on Newton’s third law—expelling gas creates thrust to lift the rocket.
- Launch vehicles use multiple stages to reduce weight and increase speed as they rise.
- Fuel type and structure of launch vehicles depend on the satellite’s weight and target orbit.
- PSLV (by ISRO) is a multi-stage launch vehicle used to place satellites in orbit.
- Unlike rockets, reusable space shuttles (such as NASA's) can return and be reused.
Key Points: Space Missions
Key Points: Moon Missions
- Since the Moon is the closest celestial body, it became the first target of space missions in the solar system.
- The Soviet Union’s Luna‑2 (1959) was the first spacecraft to reach the Moon; later Luna missions studied its composition, gravity, and radiation.
- Some unmanned Soviet missions successfully landed on the Moon and returned rock samples to Earth.
- The USA conducted manned Moon missions, and in 1969, Neil Armstrong became the first human to walk on the Moon.
- India’s Chandrayaan‑1 (2008) discovered the presence of water on the Moon, making India the first country to do so.
Key Points: Mars Missions
- Mars Mission (Mangalyaan) by ISRO was launched in 2013 and successfully entered Mars orbit in 2014.
- It was a low-cost mission that provided important data on Mars' surface and atmosphere.
- Rakesh Sharma was the first Indian in space (1984), and stayed 8 days under the Indo-USSR program.
- Kalpana Chawla spent 336 hours in space but died in 2003 during the Columbia shuttle disaster.
- Sunita Williams worked 29 hours outside the space station and spent 192 days in space, setting a record.
Concepts [15]
- The Universe
- Galaxy and Its Types
- Our Solar System
- Rockets and Its Structure
- Propellants and Its Types
- Satellite Launch Vehicles
- Indian Space Research Organization (ISRO)
- Concept of Space Missions
- Moon Missions
- Mars Missions
- Indian Scientist
- National Aeronautics and Space Administration (NASA)
- NASA Space Mission: Apollo Mission
- NASA’s work with ISRO
- Work of Indians at NASA
