Space and time

2. To send a missile, space vehicle, satellite, or other object into the air or into space
5. Space and everything that exists in it, including the Earth and all the other planets
7. To bring a plane down to the ground
8. A vehicle that can travel in space
11. The process of moving a plane down onto the ground at the end of a journey
12. The force that makes any two objects that have mass move towards each other
13. A vehicle that travels into space and back to Earth and lands like a plane
14. Someone who studies the stars and planets using scientific equipment including telescopes
15. Operated or controlled by people
19. A piece of rock that has fallen from space and landed on the ground
20. The path that is taken by an object moving around a larger object in space
21. The people who work on a ship, aircraft etc

1. A piece of equipment shaped like a tube that you look through to make distant objects look closer and larger
3. Someone who travels and works in space
4. The whole universe
6. An object that is sent into space to travel round the Earth in order to receive and send information
9. Crash into each other
10. The air round the Earth or round another planet
16. A mass of rock that moves around in space
17. The broken pieces that are left when something large has been destroyed, especially by an explosion, fire, or accident
18. The moment when a spacecraft enters the Earth's atmosphere again
19. An important piece of work that a person or group of people has to do for a government or large organization, especially one that involves travel