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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| Hercules A |
The strongest radio source in the constellation Hercules, associated with an elliptical galaxy. Two long jets extend for half a million light years into space from the faint nucleus.
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