Space

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Across
  1. 4. all of space and everything in it
  2. 6. to think of
  3. 7. brightness brightness a star would have if it were a standard distance from earth
  4. 8. brightness its brightness seen from earth
  5. 11. a group of single stars
Down
  1. 1. dwarf the blue white core that is left behind cools
  2. 2. a star explodes and becomes millions of times brighter
  3. 3. year the distance that light travels in a year
  4. 5. bang in what the universe exploded
  5. 7. to thoroughly look at
  6. 9. a contracting cloud of gas and dust with enough mass to form a star
  7. 10. a large cloud of gas and dust containing an immense volume of material.