Space crossword

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Across
  1. 2. something that happens when a massive star dies out
  2. 3. something we don’t know the size of
  3. 4. something that is normally rocky
  4. 6. a white dwarf reacting to a nebula
  5. 7. little planets bigger brothers
  6. 9. something that is a star and a planet at the same time
  7. 10. something with lots of mass
  8. 11. something made from a gas
  9. 13. something that’s orbits a planet
  10. 15. IAIAIAIIAIAIIEIAEIEIIEiEieiaiaeiaei
Down
  1. 1. how are you this good
  2. 5. a planet that is too small to be one
  3. 8. something that can harbour a star
  4. 12. something that’s hard to break (in laws)
  5. 14. when a planet spins around a star or another planet