STARS

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Across
  1. 4. billions of years fusing hydrogen to helium
  2. 8. two known sets of fusion reactions by which stars convert hydrogen to helium
  3. 9. A star showing a sudden large increase in brightness and thenslowly returning to its original state over a few months
  4. 12. neutrons are packed so densely they can not occupy the same quantum state
  5. 13. A ring shaped nebula formed by an expanding shell of gas around an aging star
  6. 14. physical property of a spinning system such that its spin remains constant
Down
  1. 1. White dwarfs, neutron stars, and black holes
  2. 2. A very small dense star that is typically the size of a planet
  3. 3. The maximum mass of a stable white dwarf star
  4. 5. rapid collapse and violent explosion
  5. 6. A neutron star with an extremely strong magnetic field
  6. 7. Positional numeral system that uses only two symbols, 0 and 1, to represent numbers
  7. 10. what prevents white dwarfs from collapsing
  8. 11. neutron stars that has two bright lights