space

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Across
  1. 2. one atom is combined with another
  2. 4. Dense part of stellar nebula
  3. 6. this is the stage our sun is in
  4. 8. same as a red giant but bigger
  5. 10. star expands and grows to be about 100 times its size
  6. 11. clouds of dust and gas
  7. 12. core of what is left from the planetary nebula
Down
  1. 1. Star After a supernova, the space in between the atom
  2. 3. outer layer of red giant (dust and gas)
  3. 5. Enormus explosion
  4. 7. Gravity is so strong that light can't escape it
  5. 9. white dwarf has completely cooled off