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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| Alcor 80 Ursae Majoris |
The fourth magnitude A star that forms a naked-eye double with Mizar in the bear’s tail. The two stars are separated by 11.5 arc minutes on the sky and 10 light years in space.
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