Could there be life on another planet?

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Across
  1. 1. a vehicle used to travel in space
  2. 5. adjective that means 'related to our sun'
  3. 8. a planet that orbits a star that isn't our sun
  4. 9. someone who studies planets, moons and stars
  5. 10. the path a planet takes around a star noun)
  6. 11. an set of lenses used to see stars and planets
  7. 13. general weather conditions
Down
  1. 2. a large mass of rock or metal that travels around a star
  2. 3. adjective that means 'related to atmosphere'
  3. 4. the scientific study of stars, moons and planets
  4. 6. the gases that surround a planet
  5. 7. the distance between two waves of energy
  6. 12. adjective which means 'related to planets'