Astronomy Crossword

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Across
  1. 3. a star with a mass less than 2 solar masses
  2. 5. when neutrons can't be packed any closer together
  3. 7. the stellar core left behind after a dying star has exhausted its nuclear fuel and expelled its outer layers to form a planetary nebula
  4. 9. a system of 2 astronomical bodies of the same kind that are comparable in size
  5. 10. the momentum of a rotating object does not change unless some type of external torque is applied
  6. 12. a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles
  7. 13. a quality of matter occurring when it is compressed to the point that electrons fill the lowest quantum states
  8. 14. White dwarfs, neutron stars, and black holes
Down
  1. 1. a region of cosmic gas and dust formed from the cast- off outer layers of a dying star
  2. 2. one of the 2 known sets of fusion reactions by which stars convert hydrogen to helium
  3. 4. a type of neutron star with an extremely powerful magnetic field
  4. 6. rapid collapse and violent explosion of a massive star
  5. 8. a star having a mass more than 1.44 times that of the Sun does not form a white dwarf but instead continues to collapse
  6. 11. A strong rapid increase in the brightness of a star