Extreme universe

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Across
  1. 4. Largest asteroid discovered
  2. 6. Another word for reality
  3. 8. Collapsed star cores which attract large amount of matter
  4. 9. Stars core collapsing into a black hole
  5. 11. Massive black hole that is the centre of galaxies
  6. 12. A disk of matter and plasma that orbits a black hole
  7. 14. Hypothetical opposite of black holes, which repel matter
  8. 15. Word that describes stars exploding
Down
  1. 1. Extremely large stars that have black holes for cores
  2. 2. Clouds of gas in space, responsible for making stars
  3. 3. Unit of mass commonly used in astronomy
  4. 5. Common gas which is a part of stars
  5. 7. Rays that shoot out of blackholes
  6. 10. Previous largest star
  7. 13. Dense remnant of a star going supernova