The Universe

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Across
  1. 1. An invisible force that pulls things toward each other
  2. 6. The process by which two or more small nuclei fuse to make a bigger nucleus
  3. 9. The distance that light travels in one year
  4. 11. All of space and everything in it
  5. 12. Particles found within the atom, mainly protons, neutrons, and electrons.
  6. 14. Super hot glowing ball of gas that makes its own light
Down
  1. 2. The average distance between the earth and the sun
  2. 3. Tiny particle with no charge
  3. 4. A large cloud of dust and gas in space
  4. 5. A collection of stars, dust, and gas bound together by gravity
  5. 7. Smallest particle of an element
  6. 8. A state of matter that starts as a gas and then becomes charged.
  7. 10. A pure substance made of only one kind of atom
  8. 13. Positively charged subatomic particle