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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| Sagitta The Arrow |
The third-smallest constellation, but nevertheless a rather distinctive little group of stars, included in the 48 constellations listed by Ptolemy c. AD 140. The two brightest stars are third magnitude. It lies in a rich part of the Milky Way, next to Aquila.
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