Stars

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Across
  1. 2. Large cloud of gas and dust
  2. 4. bang when the universe exploded into existence
  3. 7. a contracting cloud of gas and dust
  4. 8. distance that light travels in a year
  5. 10. brightness brightness seen from earth
Down
  1. 1. dwarf the blue white core that is left behind and cools
  2. 3. all of space and everything in it
  3. 5. explosion of a star
  4. 6. brightness Brightness a star would have if it were at the standard distance from earth
  5. 9. group of single stars, star systems, star clusters, dust and gas bound together by gravity