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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| Abell Catalogue |
A catalogue of 2,712 rich clusters of galaxies drawn up by George Abell from the Palomar Sky Survey photographs. He demonstrated that there are two types of galaxy cluster: a compact type that is regular in shape and a more spread-out, irregular type.
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