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Across
  1. 2. the center of a planet
  2. 6. the phase of water needed to find life
  3. 8. a planet of the Solar system where there is no atmosphere because it is too small
  4. 9. the force that holds the gases around a planet
  5. 12. the number of planets in the Solar system
  6. 13. the name of the planet that are rocky, like Earth
  7. 14. the position of the habitable zone depends on the … of the star
  8. 15. all the galaxies
  9. 16. where we could find life
  10. 17. a planet very close to the habitable zone of the Sun
Down
  1. 1. the planet farther from the Sun
  2. 3. the name of our galaxy
  3. 4. the name of our star
  4. 5. the phase of water depends on temperature and …
  5. 7. Pluto is not really a planet, it’s a … planet
  6. 10. without it, there is no pressure so no liquid water on a planet
  7. 11. the Earth’s atmosphere is protected by a … shield