lesson 3 and 4 vocab words

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Across
  1. 5. a blue white core left after a star
  2. 6. the distance light travels in a year
  3. 7. the brightness of stars if it was at a standard distance from the earth
  4. 8. stars that explode
  5. 10. large cloud of gas and dust
Down
  1. 1. all of space and everything in it
  2. 2. light seen from earth
  3. 3. first stage of a stars formation
  4. 4. what created the universe a big explosion
  5. 9. a groupe of stars and star systems