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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| Be Star |
A B star that shows emission lines of hydrogen superimposed on the absorption lines in its spectrum. Supergiants, which may also show such emission, are excluded from this classification.
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