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