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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| Mantle |
The layer in the structure of a planet or satellite lying below the crust and overlying the core. Earth’s mantle contains 65 per cent of the planetary mass.
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