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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| Tycho |
A prominent lunar crater in the Moon’s southern uplands. It is surrounded by the brightest and most extensive ray system on the Moon, possibly indicating that it is one of the youngest major features. The terraced walls rise to a height of 4.5 km and the central peak to 2.3 km above the floor of the crater, which is 85 km 53 miles in diameter.
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