space

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Across
  1. 1. life rode to earth on this according to Panspermia theory
  2. 4. the first satellte
  3. 6. cartoon dog and demoted planet
  4. 9. a thousand million
  5. 11. nothing can escape this
  6. 14. a nuclear furnace in space
  7. 15. the force that holds us on our planet
  8. 16. the third rock from the sun
  9. 19. a planets natural satellite
  10. 21. an exploding star
  11. 24. massive cool star
Down
  1. 2. a lump of rock from space that reaches the ground
  2. 3. the name of the rockets that took man to the moon
  3. 5. the "E" in SETI
  4. 7. "Little Green Men"
  5. 8. a collection of millions of stars
  6. 10. a very bright intense distant object (acronym)
  7. 12. a large stronomical distance
  8. 13. a gas in a planets atmosphere needed for life
  9. 17. Telescope named after Edwin
  10. 18. america's space company
  11. 19. the god of war
  12. 20. the first man to step foot on the moon
  13. 22. path of a satellite
  14. 23. the start of the universe