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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| Decoupling Era |
The era in the evolution of the universe, about 300,000 years after the Big Bang, when electrons and protons began to combine to form hydrogen atoms. At this point, the radiation in the universe ceased to scatter material particles and began to propagate freely. In other words, the radiation and the matter became decoupled. This phase is also called the recombination epoch.
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