Life on Other Planets

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Across
  1. 4. equation used find the amount of extraterrestrial life
  2. 5. the paradox asking where the aliens are
  3. 6. permanent day and night side
  4. 8. the presence of ____ indicates life on the planet
  5. 9. 600 light years away
  6. 10. Earth has all three forms of this
Down
  1. 1. mass of 4x the Earth
  2. 2. Life is based on ____ and water
  3. 3. searched for microorganisms on the martian surface
  4. 7. One of Jupiter's moons
  5. 11. One of Saturn's moons and atmosphere made of nitrogen