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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| Diffuse Cloud |
A cold, dark, relatively small cloud of interstellar matter, several light years in diameter. Such clouds are of relatively low density, and contain gas mainly in the form of atoms and atomic ions, with a sparse population of interstellar molecules.
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