Science crossword

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Across
  1. 4. The first neutron star to be discovered is located in the center of the ___________
  2. 6. The guy who discovered the first black hole
  3. 8. The time it takes for intermediate-mass stars to run out of energy (in years)
  4. 9. The first supernova was discovered by Canadian astronomer ____________ in 1987
  5. 11. Stars that have 12 or more solar masses
  6. 13. What low-mass stars turn into when they run out of energy
  7. 15. The solar mass of the Sun
  8. 16. A star that is not on the main sequence
Down
  1. 1. One of the biggest supernovas ever discovered
  2. 2. The colour of stars that have a surface temp of 10 000C
  3. 3. A star's total energy output per second in joules per second
  4. 5. _________ is in the center of every galaxy
  5. 7. 2 stars that orbit one another
  6. 10. What stars are mainly made out of
  7. 12. What high-mass stars form when they die out
  8. 14. On the x-axis of the HR diagram