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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| Periodic Comet |
A comet in a closed, elliptical orbit within the solar system. Periodic comets are observed at their regular returns to the Earth’s vicinity, as long as their orbit carries them near enough to be recoverable. The term is usually applied to comets with periods of less than 200 years, more strictly called short-period comets.
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