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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| Mascon |
An area of anomalously strong gravitational field on the Moon. The word is a contraction of mass concentration. Mascons are presumed to indicate the presence of rocks denser than average, though there is no consensus about exactly how they formed. The areas are roughly circular and are associated with mare areas.
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