Galaxy Crossword Puzzle

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Across
  1. 2. Supermassive black hole feeding on gas and other material at the center of a galaxy, very bright
  2. 5. Many galaxies bound to each other by gravity
  3. 7. A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
  4. 8. A supernova is a powerful and luminous explosion of a star.
  5. 10. Distance between the Earth and the Sun
  6. 13. Distance light goes in a year
  7. 14. united states space organization
  8. 15. Extremely bright center of a galaxy
  9. 16. Very bright object that has a flat spectra
  10. 18. Consists of stars, planets, and vast clouds of gas and dust, all bound together by gravity.
Down
  1. 1. Unit of measurement for large objects outside the solar system
  2. 3. A bunch of stars that we make pictures out of
  3. 4. Galaxy that is elliptical
  4. 5. Galaxy that is a spiral
  5. 6. Longest wave of light
  6. 9. Outer boundary of a black hole
  7. 11. Why goes up and down?
  8. 12. Lies at the center of every galaxy
  9. 13. Galaxy that is lenticular
  10. 17. Our home galaxy