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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| Alpheratz Sirrah; Alpha Andromedae; ^ |
The brightest star in the constellation Andromeda, marking one corner of the Square of Pegasus. It was formerly considered to belong to that constellation, being designated Delta Pegasi. Alpheratz is an A star of magnitude 2.1.
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