Space Science

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