Alpha Centauri

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Related to Alpha Centauri B: Proxima Centauri

Al·pha Cen·tau·ri

 (ăl′fə sĕn-tôr′ē)
A multiple star in Centaurus, 4.4 light years from Earth, whose three components form the brightest object in the constellation and the third brightest star in the night sky.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Al′pha Centau′ri

a triple-star system that is the brightest celestial object in the constellation Centaurus.
[< New Latin: Alpha of Centaurus]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Al·pha Cen·tau·ri

(ăl′fə sĕn-tôr′ē)
A multiple star consisting of three stars in the constellation Centaurus. It is the star nearest Earth, at a distance of 4.4 light-years, and it is the third brightest star in the night sky. ♦ Prox·i·ma Centauri (prŏk′sə-mə) is the individual star in this system that is closest to Earth, but it is very faint and far from the system's center of mass.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Alpha Centauri - brightest star in Centaurus; second nearest star to the sun
Centaurus, Centaur - a conspicuous constellation in the southern hemisphere near the Southern Cross
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References in periodicals archive ?
On the contrary, its companion Alpha Centauri B is slightly dimmer and smaller than the Sun but emits about five times more radiation than it.
For example, in 2012 observers reported that they'd found what looked like an Earth-mass exoplanet hugging the orange Sun-like star Alpha Centauri B. But follow-up work by other researchers raised a red flag (S&T: Sept.
In 2012, astronomers reported in Nature that the star Alpha Centauri B hosts a planet roughly as massive as Earth, though too warm to be habitable (SN: 11/3/12, p.
First discovered in 1915, the Alpha Centauri System is part of the Centaurus constellation and is so close to one another that its two stars, Alpha Centauri A and Alpha Centauri B, can actually be seen in the night sky.
The astrophysicist points out that the star Alpha Centauri B is optimal for searches with current telescopes because it is one of the closest to Earth.
Alpha Centauri B has recently been in the news after the discovery of an Earth-mass planet in orbit around it.
The mystery world circling Alpha Centauri B is thought to be much too hot to support life, with surface temperatures of around 1,500degC.
Training their telescope at Alpha Centauri B, the team logged more than 450 days of observation.
This artist's impression shows a planet, right, orbiting the star Alpha Centauri B, centre, a member of the triple star system that is the closest to Earth