Life Cycle of a Star

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Across
  1. 2. a star undergoes nuclear __, which turns hydrogens into helium
  2. 6. the most massive stars have the __ lives
  3. 8. most stars spend most of their lives in this stage (2 wds)
  4. 9. an example of a red supergiant
  5. 10. A __ __ is so dense that not even light can escape
  6. 12. when nuclear fusion begins, a __ becomes a star
  7. 13. a very massive star will end in an explosion, called a __
Down
  1. 1. when nuclear fusion stops, a star will __ upon itself
  2. 3. a red giant will turn into a __ __ when it loses its outer layers
  3. 4. when the diameter of a star increases after the fuel runs out, the star becomes a __ giant
  4. 5. stars give out large amounts of energy in the form of electromagnetic __
  5. 7. stars are formed from stellar __, clouds of gas and dust
  6. 11. the fusion of helium creates the element __