Chapter 16

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Across
  1. 3. a gigantic explosion that occurs near the end of the life of some stars
  2. 4. a huge system of stars, dust, and gas held together by gravity
  3. 5. rare events that were not part of the regular pattern seen in the sky
  4. 6. the distance light travels in one year
  5. 7. a point in space that has such a strong force of gravity that nothing within a certain distance of it can escape
Down
  1. 1. a cloud of gas and dust in which new stars form
  2. 2. a group of stars that forms a pattern