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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| Omega Nebula (M17; NGC 6618) |
A luminous nebula in the constellation Sagittarius, also known as the Horseshoe Nebula and the Swan Nebula. It is 4,800 light years away and 27 light years in diameter. It is a region of ionized hydrogen, excited by a group of at least five hot stars. A dark dust cloud lies on the western edge of the luminous region. See also: molecular cloud.
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