Unit 7

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Across
  1. 5. planets orbiting a star
  2. 6. everything that exists
  3. 8. the second most common galaxy
  4. 9. a huge explosion from a dead star
  5. 10. a collection of stars, dust, and gases
  6. 11. a force which tries to pull objects together
  7. 13. a really dense object that nothing can escape its gravity
  8. 14. the distance that light travels in one year
  9. 15. a thing you need to support your hypothesis
Down
  1. 1. the most common galaxy
  2. 2. the mean distance between the earth and the sun
  3. 3. well tested explanation of scientific observations of experiments
  4. 4. a disk of stars
  5. 7. a cloud of gas and dust in outer space
  6. 12. a fundamental unit