Alpha Centauri
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noun
Astronomy. a triple-star system that is the brightest celestial object in the constellation Centaurus.
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Also called Rigel Kentaurus.
Origin of Alpha Centauri
<New Latin: Alpha of Centaurus
Words nearby Alpha Centauri
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use Alpha Centauri in a sentence
Scientific definitions for Alpha Centauri
Alpha Centauri
[ ăl′fə sĕn-tôr′ē ]
A triple star system in the constellation Centaurus that is the third brightest star in the night sky, with an apparent magnitude of -0.27, and the star nearest to Earth, at a distance of about 4.2 light-years. The two brighter stars, Alpha Centauri A and B, form a binary star system, which is orbited by Proxima Centauri, a smaller, dimmer star.
The American Heritage® Science Dictionary
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