space

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Across
  1. 3. something that keeps us on Earth
  2. 4. a red planet we are currently exploring
  3. 7. it was once a planet now it isn't
  4. 8. 4th smallest planet
  5. 12. the planet we are on and exploring
  6. 13. what the milkyway is
  7. 14. someone who studies astronomy
  8. 17. the second biggest planet
  9. 18. the name of the first dog in space
  10. 20. spell rats backwards
Down
  1. 1. a dwarf planet but is in the Kuiper belt
  2. 2. something that splits us from space
  3. 5. what our galaxy is
  4. 6. something that has an eclipse
  5. 9. naughty annoying stupid aliens(initials)
  6. 10. a planet that is also a joke (it's name)
  7. 11. the smallest planet
  8. 15. our main light source
  9. 16. the biggest planet
  10. 19. someone who predicts mundane events