Space Science

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Across
  1. 4. A force that pulls one object to a bigger object
  2. 5. The study of the universe
  3. 8. A nuclear reaction in stars to create hydrogen/helium
  4. 10. An explosion of a high mass star
  5. 11. Middle of our solar system
  6. 13. Planets that do not pass the asteroid belt are...
  7. 14. A person who thought the sun was in the center of the universe
  8. 17. The process of becoming bigger
  9. 18. A cloud of gas in a galaxy
  10. 19. A star that emits light when it pulse
  11. 20. Any physical substance
Down
  1. 1. The planet we live on
  2. 2. Earliest forms of matter, 1e-16 meters
  3. 3. A person who thought Earth was in the center of the universe
  4. 6. A point with infinite density
  5. 7. Gas Giants are considered...
  6. 9. The total energy a star can radiate per second
  7. 12. Massive celestial body
  8. 15. The emission of energy as electromagnetic waves
  9. 16. Everything in existence. Stars, gases, galaxies, black holes etc