Stars and Galaxies Crossword

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Across
  1. 1. The distance that light travels in one year
  2. 3. All of space and everything in it
  3. 4. A large cloud of gas and dust containing an immense volume of a material
  4. 7. the blue-white core that is left behind a star and is made up of leftover energy
  5. 9. A contracting cloud of gas and dust with enough mass to form a star
Down
  1. 2. A stars actual brightness
  2. 5. A stars brightness seen from Earth
  3. 6. The explosion when a star blazes millions of times brighter
  4. 8. A group of single stars, star systems, star clusters, dust, and gas bound together by gravity