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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| Aldebaran Alpha Tauri; α Tau |
The brightest star in the constellation Taurus. Its Arabic name means the follower. Aldebaran is a giant K star of magnitude 0.9. Although it appears in the sky to be part of the Hyades star cluster, it is not in fact a cluster member, lying only half as far away.
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