Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
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| Open Universe |
A model of the universe in which expansion continues for ever and reaches infinity with a non-zero speed.
See also: oscillating universe, closed universe.
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