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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| Phaethon |
Asteroid 3200, diameter 6 km, discovered in 1983 by the Infrared Astronomical Satellite IRAS. It is in a highly eccentric, Earth-crossing orbit and appears to be the parent body of the Geminid meteor shower. It may be the dead nucleus of a former comet.
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