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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| Umbriel |
A satellite of Uranus, discovered by W. Lassell in 1851. Images from the Voyager 2 encounter in 1986 show that Umbriel is much darker than the other four major satellites of Uranus. It appears that the surface has been covered by dark material relatively recently in astronomical terms. It is also covered with craters; one of them, 110 kilometres in diameter, is very bright, in marked contrast to the rest of the surface.
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