Inner planets

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Across
  1. 4. Sends people to space every year
  2. 5. An ____ is when it repeatedly moves around an object
  3. 9. is this Earth's sister?
  4. 12. Has rings around itself made of rocks and gas
  5. 14. Isnt a planet, keeps us warm
  6. 15. Mercury, Venus, Earth, and Mars
Down
  1. 1. was declared a dwarf planet in 2006
  2. 2. known as the red planet
  3. 3. humans live here
  4. 6. Inner planets are alike to Earth in some ways
  5. 7. is made of gasses
  6. 8. The smallest orbit
  7. 10. A blue color planet that has thin rings made of ice
  8. 11. Isnt a spaceship, gets pictures of our planets
  9. 13. A celestial object that orbits around a planet