Supernovae

123456789
Across
  1. 4. A supernova with no hydrogen.
  2. 5. Nuclear explosions at high temperatures.
  3. 7. A temporary brightening of a star that does not result in its death.
  4. 9. The remnant of a low- or medium-mass star.
Down
  1. 1. A star that has expanded into a larger red star.
  2. 2. A powerful explosion of a star.
  3. 3. A supernova type that has hydrogen.
  4. 6. The _____ limit is approximately 1.44 solar masses.
  5. 8. A cloud of dust and gas left over from a supernova explosion.