Lesson 3 and Lesson 4

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Across
  1. 2. how the universe was created millions of years ago
  2. 3. looking at something closely
  3. 5. a star exploding
  4. 6. The blue-white core that is left behind
  5. 7. large cloud of gas and dust
  6. 9. a group of stars, star systems, and star clusters
  7. 10. contracting cloud of gas and dust
  8. 11. to find something out
Down
  1. 1. all of space and everything in it
  2. 3. how bright it actually is
  3. 4. brightness as seen from earth
  4. 8. the distance light travels in a year