The second brightest component, Alpha Centauri B, of visual magnitude 1.4, is a redder star. ![]() The brightest component star, Alpha Centauri A, resembles the Sun in spectral type, diameter, and absolute magnitude. The two brighter components, called A and B, about 0.2 light-year farther from the Sun, revolve around each other with a period of about 80 years, while Proxima circles them with a period of 550,000 years. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Īlpha Centauri, also called Rigil Kentaurus, triple star system, the faintest component of which, Proxima Centauri, is the closest star to the Sun, about 4.2 light-years distant.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century. ![]()
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