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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| New Moon |
The Moon’s phase when it is at the same celestial longitude as the Sun and thus totally unilluminated as seen from Earth.
See also: phase.
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