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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| Alnitak (Zeta Orionis; ζ Ori) |
One of the three bright stars forming Orion’s belt. The Arabic name means the girdle. Alnitak is a supergiant O star of magnitude 1.8.
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