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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| Lepus The Hare |
One of the original 48 constellations listed by Ptolemy c. AD 140. It lies immediately south of Orion, possibly representing a hare pursued by the Hunter. It is small but distinctive and contains seven stars brighter than fourth magnitude.
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