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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| Differentiation |
The process in which a body such as a terrestrial planet, which is initially homogeneous in composition, becomes stratified into different regions, usually of different densities. In the case of a planet, these would be the core, mantle and crust.
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