Big Bang Theory

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Across
  1. 5. all matter is composed of this
  2. 6. a system of millions or billions of stars, together with gas and dust,held together by the gravitational pull
  3. 9. he figured out how gravity works
Down
  1. 1. this is used to study light
  2. 2. A theory that suggest that our universe is expanding and was once much more denser that it is now.
  3. 3. made up of all matter and space that exists
  4. 4. the galaxy that we live in
  5. 6. the main reason why our universe exists
  6. 7. the star at the center of our solar system
  7. 8. an instrument that makes objects far away appear close