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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| Phase Defect |
The extent, measured as an angle, to which the illuminated area of the full Moon differs from a complete circular disc because of the inclination of the Moon’s orbit to the ecliptic.
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