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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| Yy Orionis Star |
A member of a subclass of T Tauri stars characterized by a particular form of emission line with an absorption wing to the red side. The line profiles are variable over periods of days. About half of all T Tauri stars may belong to this subclass.
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