📖 Chapter 14 of 14 · Mysterious Space- Advance 1 · Class 8
A Little Space Glossary
- Thrust
- The downward push of a rocket's escaping gas, which lifts the rocket up.
- Escape velocity
- The speed (about 40,000 km/h for the Earth) needed to break free of a world's gravity.
- Orbit
- The path of an object that keeps falling around another without landing, because of its sideways speed.
- Gravity
- The pull between any two objects with mass; stronger with more mass, weaker with more distance.
- Tide
- The rise and fall of the sea caused mainly by the Moon's gravity.
- Light-year
- The distance light travels in one year — about 9.5 trillion kilometres.
- Galaxy
- A vast collection of billions of stars; ours is the Milky Way.
- Telescope
- An instrument that gathers light with a large lens or mirror to see faint, distant objects.
- Rover
- A robot on wheels that explores the surface of another world.
- Orbiter
- A spacecraft that circles a world, studying it from above.
- Spacesuit
- A personal spacecraft that supplies air, warmth and protection to an astronaut.
- Black hole
- A region where gravity is so strong that nothing, not even light, can escape.
- Gaganyaan
- India's mission to send its own astronauts, called Gaganauts, into space.