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Alpha Centauri
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Alpha Centauri
noun
Astronomy. a triple-star system that is the brightest celestial object in the constellation Centaurus.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Alpha Centauri
is always a great word to know.
So is companion. Does it mean:
| the fainter of the two stars that constitute a double or binary star |
| the magnitude or brightness of a star as it appears to an observer on the earth |
American Heritage
Science Dictionary
Alpha Centauri  (āl'fə sěn-tôr'ē) Pronunciation Key
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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