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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| Emission Line Galaxy |
Any galaxy that displays emission lines in its spectrum. This is a sign of unusual activity in the nucleus of the galaxy or of very rapid star formation. active galactic nucleus.
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