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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| Meridian 2 |
A line of longitude on the Earth, or on another astronomical body. On the Earth, the meridian through Greenwich marks the zero of longitude and is sometimes referred to as the prime meridian.
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