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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| Theophilus |
A large lunar crater to the north-west of Mare Nectaris, overlapping another large crater, Cyrillus. Theophilus is 100 kilometres 60 miles in diameter and its terraced walls rise 5 km above the floor. A complex central peak rises to 2.2 km.
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