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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| Geoid |
A surface defined by mean sea level in the open ocean and, on land, the surface that would be taken up by water in an imaginary network of frictionless channels connected to the sea.
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