Stars and Stellar Evolution Crossword

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Across
  1. 1. ________________ fusion occurs by the triple alpha process.
  2. 3. The process by which stars make new elements is called _____________________.
  3. 5. All low mass stars end their life as a ___________________.
  4. 6. Heavier elements in high mass stars are fused by _________________ capture.
  5. 7. A star that is fusing hydrogen and helium in shells surrounding an inert carbon core.
  6. 10. The number of stars in the observable universe is roughly 70 ______________ ____________.
  7. 11. A stellar remnant detected on Earth as rapid, perfectly spaced bursts of radiation.
  8. 13. _______________ fusion occurs by both the proton-proton chain and the CNO-cycle.
  9. 14. A phase in the evolution of medium mass stars that has nothing to do with planets.
  10. 17. An explosion caused by the collapsing core of a high mass star that leaves a stellar remnant.
  11. 18. A ________________ is about 9.5 trillion kilometers.
Down
  1. 2. A star that is fusing hydrogen in a shell surrounding an inert helium core.
  2. 4. A star that is fusing helium in its core is a _______________________ star.
  3. 8. A star that is fusing hydrogen in its core is a _______________________star.
  4. 9. An explosion caused by the collapsing core of a high mass star that doesn’t leave any remnant.
  5. 12. All low mass stars begin their life as a ___________________.
  6. 15. A stellar remnant left behind by a high mass star of initial mass less than about 20 solar masses.
  7. 16. A stellar remnant left behind by a high mass star of initial mass greater than about 20 solar masses.
  8. 19. When the core of a high mass star is full of the element _______________, it no longer produces energy.