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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| Perseus |
A large and interesting constellation of the northern hemisphere lying in a rich part of the Milky Way. It is one of the 48 listed by Ptolemy c. AD 140 and contains ten stars brighter than fourth magnitude, including the noted variable star Algol. Perseus also includes a magnificent pair of open clusters visible to the naked eye, known as the Double Cluster in Perseus.
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