Space Pt. 2

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Across
  1. 2. orbits the Earth 15.5 times a day
  2. 3. one of the only planets to NOT have a moon
  3. 9. an orbit that is oval shaped
  4. 11. This separates the inner and outer planets
  5. 12. something that orbits something else
  6. 14. invented the telescope and discovered 4 moons
  7. 16. a reusable spacecraft
  8. 17. This means "Earth-centered"
Down
  1. 1. This means "sun-centered"
  2. 4. The largest planet
  3. 5. unmanned object that lands on another planet
  4. 6. galaxy that we live in
  5. 7. this powers the ISS
  6. 8. holds everything in the solar system together
  7. 10. 4 planets that are spheres of rock
  8. 13. One of the Galilean moons
  9. 15. 1st person on the moon