The Star Cycle

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Across
  1. 5. large cloud of gas and dust-star nursery
  2. 7. high pressure/temperatures begin nuclear fusion
  3. 8. highly luminous star in 3rd stage of life
  4. 9. outer gases drift away-core heats up
Down
  1. 1. protons and electrons smash forming neutrons
  2. 2. inward force equal to force of gravity
  3. 3. hot-dim star-left over from supernova
  4. 4. diagonal pattern on HR Diagram
  5. 6. large-bright-hot core made of mostly hydrogen