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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| Secular Acceleration |
The systematic increase in the velocity of the Moon in its orbit around the Earth, a result of tidal interaction with the Earth and the gravitational attraction of other planets.
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