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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| R Coronae Borealis |
The prototype of a group of peculiar variable stars characterized by sudden and unpredictable dips in brightness of many magnitudes. R Coronae Borealis R CrB is normally magnitude 5.8, but every few years becomes up to nine magnitudes fainter when enshrouded in a dust cloud blown off by a strong stellar wind. About forty stars of similar type are known, typically supergiant stars of spectral type F or G.
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