Alpha Centauri

The closest star system to the Sun, at a distance of more than four light-years, Alpha Centauri consists of three stars. Two of the stars -- one of which is similar to the Sun, while the other is a little smaller and cooler -- form a tight pairing. The third, known as Proxima Centauri, is about one-tenth of a light-year from the other two, and is a red dwarf star. It is closer to Earth than the other two stars, but it is so faint that it is not visible to the unaided eye.


Facts and Figures The biggest, farthest and fastest in the...

Featured Images

Artist's depiction of planet orbiting Alpha Centauri B
Close Neighbor Sunday, April 21, 2013
Neighbors Tuesday, April 14, 2009

Radio Programs

Alpha Centauri Planet A nearby planetary neighbor Sunday, April 21, 2013
The Llama The sparkling eyes of the llama Saturday, May 26, 2012
Proxima Centauri A faint but busy stellar neighbor Thursday, April 16, 2009
Alpha Centauri B A familiar-looking neighbor Wednesday, April 15, 2009
Alpha Centauri Getting to know the neighbors Tuesday, April 14, 2009
Centaurus Trotting across southern skies Monday, April 13, 2009


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