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