astronomy

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Across
  1. 2. The force that attracts everything with mass
  2. 4. The forth state of matter (not gas, solid,liquid)
  3. 5. used to be a planet but not anymore :(
  4. 7. the black hole in the middle of the Milky Way
  5. 9. the gravity is so strong that light can't escape
  6. 10. the closest galaxy to the Milky Way
  7. 12. a collection of asteroids orbiting between mars and Jupiter
  8. 14. The hottest planet in the solar system
  9. 15. a collapsed core of a star with 10-25 solar masses
  10. 16. (easy)the third planet from the sun
Down
  1. 1. the universe expanded quickly from a singularity
  2. 3. a collection of comets and asteroids beyond Neptune
  3. 4. the closest star to the solar system
  4. 6. made up mostly by hydrogen and helium
  5. 7. a group of planets orbiting a star
  6. 8. The biggest moon in the solar system (bigger than mercury)
  7. 11. The galaxy we live in
  8. 13. a yellow dwarf star that's in the middle of the solar system