Stars and Supernovas

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Across
  1. 1. All of the elements that make up our planet come from ___ stars
  2. 4. If three helium atoms undergo nuclear fusion, a __ atom will form
  3. 6. Process that occurred right after the big bang in which protons and neutrons combined to make hydrogen and helium nuclei
  4. 7. An exploding star
  5. 8. large cloud of dust and gas from which new stars can form
  6. 10. a huge cluster of gas, dust, billions of stars and their solar systems
  7. 11. Name of our galaxy
  8. 13. Study of the universe
Down
  1. 2. During the big bang, the universe expanded very quickly in a process called cosmic ___
  2. 3. stars form from dense clouds of hydrogen and helium called ___ clouds
  3. 5. When two or more smaller nuclei fuse together to make a single, larger nuclei, nuclear ___ occurs
  4. 9. area is space where gravity is so strong that light cant escape
  5. 12. Before electrons were attached to atoms, they created a ___ that scattered light