Planets and Asteriods

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Across
  1. 7. Venus is the hottest planet because this gas.
  2. 8. the terrestrial planets are composed of rock and _________.
  3. 9. the NEAR spacecraft was the first to land on Eros, an ___________.
  4. 10. one of two gases that makeup Jupiter & Saturn.
  5. 11. the type of gas that the sun formed from.
  6. 14. the asteroid belt is found between Jupiter and _______.
  7. 16. a meteor that crashed on Earth.
  8. 17. 80% of the atmosphere of Neptune’s moon Triton (and Earth).
  9. 18. density of Venus' atmosphere is one ________ times Earth's.
  10. 19. the clouds of Venus contain this acid.
Down
  1. 1. our solar system originated in a ...
  2. 2. Mars is red because of an oxide of this element.
  3. 3. one of two gases that makeup Jupiter & Saturn.
  4. 4. a little rock in space.
  5. 5. why Uranas and Neptune are aqua color.
  6. 6. the Sun started out as a cloud of gas that condensed by this force.
  7. 10. density of Mars' atmosphere is one ________ of Earth's.
  8. 12. the Moon and this planet are very similar.
  9. 13. the Earth and this planet are almost the same diameter.
  10. 15. the moons of Mars are probably captured ____________.