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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| Einstein-De Sitter Universe |
The simplest of the modern cosmological models, in which the universe has zero pressure and zero curvature i.e. flat geometry, is of infinite extent, expands without limit and endures for all time. Proposed in 1932, it is a special case, with zero curvature, of the more general Friedmann universe.
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