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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| Tycho’s Star |
A supernova in the constellation Cassiopeia observed by Tycho Brahe in 1572. At maximum brightness it rivalled Venus and was visible in daylight. The supernova remnant is both an X-ray source and an intense source of radio emission; the expanding shell of gas is faintly visible with powerful optical telescopes.
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