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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| Earthshine |
A faint illumination of what would otherwise be the dark part of the Moon when its phase is a thin crescent. The effect is caused by sunlight reflected by the Earth towards the Moon. A popular expression describes the appearance as the new Moon in the old Moon’s arms.
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