Aliens

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Across
  1. 3. The vast, empty area beyond Earth's atmosphere.
  2. 4. A bright, shining celestial body in space.
  3. 5. To travel and investigate new places or worlds.
  4. 6. A person who travels in space.
  5. 10. A celestial body that orbits a star.
Down
  1. 1. When aliens come to Earth in large numbers.
  2. 2. A device used to explore and gather data in space.
  3. 3. A vehicle used for space travel.
  4. 7. An instrument to see distant objects in space.
  5. 8. Unidentified Flying Object, a mysterious spacecraft.
  6. 9. A massive system of stars, gas, and dust in space.