The death of stars

123456789
Across
  1. 2. a place so dense, not even light can escape
  2. 4. the ending of a star between 1.4MSun and 3MSun
  3. 6. explode in a supernova
  4. 7. the explosion from the death of a massive
  5. 8. end life for stars under 1.4MSun
Down
  1. 1. a dying star before collapse
  2. 3. what 90% of our stars are
  3. 5. a white dwarf when it's energy runs out
  4. 9. the element at the center of a star that