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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| Kreep |
An acronym given to a group of basaltic rocks found on the Moon, which are particularly rich in potassium symbol K, rare earth elements REE, and phosphorus P, though the composition varies widely between different types. Samples of KREEP were returned from the Oceanus Procellarum by the Apollo 12 mission. These were rich also in uranium, thorium and zirconium.
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