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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| Isotropy |
The property of being the same in every direction. Liquid water is isotropic, whereas a snowflake, which has sixfold symmetry, is not. The universe on the largest scales is believed to be isotropic. It is observed to be expanding isotropically to a high degree of precision, and the cosmic background radiation is equally isotropic.
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