Big bang theory

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Across
  1. 3. the apparent change in wave frequency as an energy source moves towards or away from the observer
  2. 6. a system of billions of stars
  3. 9. the tremendously powerful explosion of an incredible dense mass about 15-20 billion years ago that produced the expanding universe that exists today.
  4. 10. includes our sun, the nine planets and many moons
Down
  1. 1. as a source of visible light moves away from observer
  2. 2. something in space such as stars or planets
  3. 4. all existing matter space considered a whole cosmos
  4. 5. relative brightness of something
  5. 7. the north star which is located almost directly above earths geographic north pole
  6. 8. a fixed luminous point in the night sky that is large