Science and Medical Discoveries: Astronomy

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Across
  1. 4. Man who proved Einstein right
  2. 6. Second person on the Moon
  3. 8. A NASA project that includes two probes
  4. 10. Invented the telescope
  5. 12. One of the best physicists of all time
  6. 14. A famous government agency that deals with astronomy
  7. 16. The branch of science to do with space
  8. 18. Two trillion are known in the observable universe
  9. 19. Our planet
Down
  1. 1. The distance of the universe we can see
  2. 2. Our galaxy
  3. 3. Revolves around the Earth
  4. 4. What the Earth spins on
  5. 5. A famous telescope launched in 1990
  6. 6. The theory of how the universe was made
  7. 7. Person who made the first sun-centered model
  8. 9. Man who made the laws of motion
  9. 11. Someone who studies astronomy
  10. 13. What keeps people on the ground
  11. 15. First man on the Moon
  12. 17. Fourth planet from the Sun