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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| Flare Star |
A dwarf M star that undergoes unpredictable outbursts lasting a few minutes, during which the brightness may increase by a magnitude or more. All flare stars have emission lines in their spectra and the flares are thought to be phenomena in the stellar chromosphere, similar to flares, but far more energetic. The nearest star to the Sun, Proxima Centauri, is a flare star. Flare stars are also known as UV Ceti stars.
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