space and stuff

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Across
  1. 2. the sister planet of earth
  2. 5. the extent or amount of space between two this the extent or amount of space between two things, points, lines
  3. 7. nasa wants to set foot on this planet
  4. 9. outside our solar system.
  5. 11. when you see two full moons in one month
  6. 13. a natural luminous body visible in the sky especially at night
Down
  1. 1. has a big hurricane
  2. 3. moon
  3. 4. alien
  4. 6. a collection of stars and planets that are held together by gravity
  5. 8. most moons
  6. 10. was dethroned as a planet
  7. 12. the planet we live on