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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| Irregular Variable |
A pulsating variable star that changes in brightness slowly and in an irregular way. Such stars belong mainly to spectral types K, M, C and S.
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