BIG BANG

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Across
  1. 4. big hot fiery ball of gas in space
  2. 6. loud bang or pop
  3. 10. a person who goes to space
  4. 11. cloud of dust or gas in space
  5. 12. going around the sun
  6. 15. a place not on earth no air no sound
Down
  1. 1. the start of everything coming from an explosion
  2. 2. where every things stars
  3. 3. where life is habitable
  4. 5. second planet from the sun
  5. 7. other places like the earth
  6. 8. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
  7. 9. National Aeronautics and Space Administration
  8. 13. possibly true possible not true
  9. 14. a floating big rock in space