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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| Retrograde |
Motion of an object on the celestial sphere in the east-west direction, or, for orbital motion or axial rotation in the solar system, motion that is clockwise as observed from north of the ecliptic.
See also: direct.
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