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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| Deep Sky Object |
An object of astronomical study that does not belong to the solar system. The expression is not precisely defined and is used primarily by amateur astronomers as an umbrella term for both galactic and extragalactic objects, such as nebulae and galaxies.
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