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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| Pegasus The Winged Horse |
A large northern constellation included by Ptolemy in his list of 48 c. AD 140. It is noted for the prominent square - the Square of Pegasus - formed by its three brightest stars and Alpha Andromedae Alpheratz, all of which are second magnitude. Alpha Andromedae used to be considered to belong to Pegasus and was known as Delta Pegasi.
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