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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| Cassini Division |
The conspicuous gap, 2,600 1,600 miles kilometres wide, between the two main components A and B of the rings of Saturn.
See also: planetary rings
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