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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| Kapteyn’s Star |
An eighth magnitude M star HD 33793, notable for its relatively large proper motion 8.7 arc seconds per year - the second largest known after Barnard’s star - and high radial velocity 245 km/s. At a distance of 12.7 light years, it is among the stars nearest to the solar system. Its properties were discovered in 1897 by the Dutch astronomer J. C. Kapteyn 1851-1922, and it lies in the southern constellation Pictor.
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