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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| Canis Major The Greater Dog |
A small constellation, just south of the celestial equator and next to Orion, containing the brightest star in the sky, Sirius. It is said to represent one of the dogs following the hunter, Orion, and was listed by Ptolemy c. AD 140.
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