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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| Hydrus The Water Snake |
An inconspicuous southern constellation, introduced by Johann Bayer in his 1603 star atlas. Its three brightest stars are third magnitude.
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