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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| Time |
The means by which the intervals between sequential events are measured.
See also: civil time, International Atomic Time, Mean Solar Time, sidereal time, spacetime, Universal Time.
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