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