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a unit of length equal to the distance light travels through space n one year.
unifying scientific explanations for a broad range of hypotheses and observations that have been supported by scientific evidence
the place or form from which something comes or is derived
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
occurs when a light source moves away from an observer
occurs when a light source moves toward an observer
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