Unit 3 Vocab - The Origin of the Universe

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Across
  1. 2. A ___ is a system of billions of stars and planets held together by gravitational attraction
  2. 4. _____ law is a theory that the universe is constantly expanding
  3. 9. A shift in the lines of an object's spectrum toward the red end that indicates that an object is moving away from the observer.
  4. 11. a tiny single point
  5. 12. another name for a molecular cloud (large cloud of dust and gas)
  6. 14. a force that pulls objects toward each other
  7. 15. an infinitely dense point of matter that does not follow the laws of physics
Down
  1. 1. _____ clouds are large clouds of very cold dust and gas
  2. 3. A shift in the lines of an object's spectrum toward the blue end that indicates that an object is moving toward from the observer
  3. 5. area of space where gravity is so strong that not even gravity can escape
  4. 6. a gigantic explosion that occurs when a star collapses and throws its outer layers into space
  5. 7. the study of the universe
  6. 8. The ____ theory states that the universe formed from the sudden expansion
  7. 10. ___ radiation is radiation leftover from the big bang that is found all throughout the universe
  8. 13. a hot ball of gas that undergoes nuclear fusion