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8 Science
8.8 DE Origin or the Universe and Light Years
Question | Answer |
---|---|
Light Year | a unit of length equal to the distance light travels through space n one year. |
ScientificTheories | unifying scientific explanations for a broad range of hypotheses and observations that have been supported by scientific evidence |
Origin | the place or form from which something comes or is derived |
Universe | all space and the matter space contains |
Big Bang Theory | a theory that days that the universe began as a small point that expanded rapidly about 13.7 billion years ago |
Red Shift | occurs when a light source moves away from an observer |
Blue Shift | occurs when a light source moves toward an observer |
Oscillating Theory | the theory that states the universe will continue to expand and contract in a cycle, forever |
Big Crunch Theory | the theory that states the expansion of space will eventually reverse and will recollapse, ultimately causing the cosmic scale factor to reach zero or cause a reformation of the universe with another "bang" |
Evidence that Supports the Big Bang Theory | red shift and the Cosmic Microwave Background radiation |