Life Cycle of a Star

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Across
  1. 4. massive explosion that forms when a large star collapses
  2. 5. created after a supernova when all of a star's material collapses back in on itself
  3. 6. dead, dense core left after a planetary nebula
  4. 7. star that forms once it begins to run out of hydrogen and helium atoms start to fuse
  5. 8. process by which stars produce energy
  6. 11. the coolest stars are this color
Down
  1. 1. massive cloud of gas and dust that collapses under the influence of gravity
  2. 2. the hottest stars are this color
  3. 3. created when a star runs out of helium and gives out a large burst of energy
  4. 9. area of the Sun where nuclear fusion occurs
  5. 10. massive object in space that creates energy and radiates it as electromagnetic radiation