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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| Cancer The Crab |
A zodiacal constellation, among those listed by Ptolemy c. AD 140. It is said to represent the crab crushed under the foot of Hercules when he was fighting the Hydra. None of the stars is brighter than fourth magnitude, though the star cluster Praesepe at the constellation’s centre can be seen with the unaided eye.
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