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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| Penumbra 1 |
A region of partial shadow. During a solar eclipse, when the Moon’s shadow sweeps across the surface of the Earth, observers in the penumbral zone see only a partial eclipse.
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