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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| Merak Beta Ursae Majoris; β Uma |
One of the two stars of the Plough in Ursa Major with Dubhe called the Pointers. The stars in the Plough have been designated by position rather than in brightness order. It is therefore actually the fifth-brightest star in the constellation, with a magnitude of 2.4. Merak is an A star and its name, of Arabic derivation, means the loin.
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