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| a theory that deduces a cataclysmic birth of the universe from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics |
| the boundary around a black hole on and within which no matter or radiation can escape |
| Main Entry: | impact crater |
| Part of Speech: | n |
| Definition: | a depression in the ground believed to have been caused by a meteorite |
| Example: | Does the earth have impact craters? |