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Astronomy · Stars

Alpha Centauri

The nearest star system to the Sun.

ScienceIntermediate

The Sun's closest neighbors

Alpha Centauri is the nearest star system to the Sun, just over four light-years away in the southern constellation Centaurus. To the unaided eye it appears as a single brilliant point, but it is actually multiple stars.

A triple system

The system contains two Sun-like stars, Alpha Centauri A and B, orbiting each other, plus the faint red dwarf Proxima Centauri. Their nearness makes them prime targets for studying other stars in detail.

A southern sight

Alpha Centauri is a brilliant feature of the southern sky and, with nearby Beta Centauri, points toward the Southern Cross. It is not visible from most northern latitudes.

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