Space and time

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Across
  1. 2. To send a missile, space vehicle, satellite, or other object into the air or into space
  2. 5. Space and everything that exists in it, including the Earth and all the other planets
  3. 7. To bring a plane down to the ground
  4. 8. A vehicle that can travel in space
  5. 11. The process of moving a plane down onto the ground at the end of a journey
  6. 12. The force that makes any two objects that have mass move towards each other
  7. 13. A vehicle that travels into space and back to Earth and lands like a plane
  8. 14. Someone who studies the stars and planets using scientific equipment including telescopes
  9. 15. Operated or controlled by people
  10. 19. A piece of rock that has fallen from space and landed on the ground
  11. 20. The path that is taken by an object moving around a larger object in space
  12. 21. The people who work on a ship, aircraft etc
Down
  1. 1. A piece of equipment shaped like a tube that you look through to make distant objects look closer and larger
  2. 3. Someone who travels and works in space
  3. 4. The whole universe
  4. 6. An object that is sent into space to travel round the Earth in order to receive and send information
  5. 9. Crash into each other
  6. 10. The air round the Earth or round another planet
  7. 16. A mass of rock that moves around in space
  8. 17. The broken pieces that are left when something large has been destroyed, especially by an explosion, fire, or accident
  9. 18. The moment when a spacecraft enters the Earth's atmosphere again
  10. 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