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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| Early-Type Star |
An obsolete term applied to the hottest and most massive types of stars, usually those of spectral types O, B and A. The expression reflects the belief once held, but now known to be completely wrong, that the sequence of spectral classes - from hottest to coolest - represents an evolutionary progression. Despite its misleading nature, the term is still frequently used.
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