Voyage to Mars

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Across
  1. 2. 687 Earth days is the same as 1 _______ on Mars
  2. 5. Mars is about half the size of which planet?
  3. 7. Astronauts have to (de)compress in this before and after a spacewalk
  4. 8. Scientists believe this was once on Mars
  5. 9. Mars is the ______ planet from the Sun
  6. 10. The larger of Mars' moons
  7. 12. Rovers on Mars are given directions through computer ________
  8. 14. NASA has sent 5 of these to Mars
  9. 16. Mars and Earth are considered to be this kind of planet
  10. 18. Mars is known as the _________ planet
  11. 19. Olympus Mons is the highest one in our solar system
Down
  1. 1. The smaller of Mars' moons
  2. 3. Astronauts have to do this for 2 hours daily
  3. 4. These can grow on sweaty or dirty clothing
  4. 6. The number of moons Mars has
  5. 11. There is very little of this gas in Mars' atmosphere
  6. 13. Mars is known for these types of storms
  7. 15. Mars' soils contain this metal
  8. 17. This is what keeps astronauts safe on a spacewalk