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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| Alkaid Eta Ursae Majoris; η Uma |
A star in Ursa Major, at the end of the bear’s tail. It is a B star of magnitude 1.9. The Arabic name means chief of the mourners, for the Arabs saw the constellation as a bier rather than a bear.
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