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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| Fu Orionis Star |
A type of variable star characterized by a brightening over a period of the order of a year by as much as five or six magnitudes, followed by a long period decades of constancy or slow decline. These stars are supergiants of spectral types F and G, and are surrounded by dust and nebulosity.
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