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