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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| Tau Ceti τ Cet |
A star of the same type as the Sun, lying at a distance of 11.7 light years. It is the seventeenth-nearest star known, but, at magnitude 3.5, one of only a handful of nearby stars visible to the naked eye.
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