Science Vocabulary, Part 3

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Across
  1. 6. dark area of the Moon's surface
  2. 7. synonymous to orbit
  3. 11. how long an orbit takes
  4. 13. a space object like Venus or Jupiter
  5. 15. the galaxy that our solar system is in
  6. 16. a star that Earth always tilts towards
  7. 17. a period of time
  8. 18. to rotate around an object
Down
  1. 1. a collection of a star, planets, and other space objects
  2. 2. a meteor that has crashed into Earth
  3. 3. luminescent part of interstellar medium
  4. 4. chunk of rock and metal in space
  5. 5. the collection of everything that exists
  6. 8. a young star
  7. 9. light that humans can see
  8. 10. a star towards the end of its life
  9. 12. recreation of an object or event
  10. 14. chunk of rock that orbits a planet