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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| Barycentre |
The centre of mass of a system of objects moving under the influence of their mutual gravity. The barycentre of the solar system, for example, is constantly moving as the relative positions of the planets particularly the major ones change. It lies about a million kilometres from the centre of the Sun.
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