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Alpha Centauri (the brightest star in the constellation Centaurus) is the closest star to earth, and is actually a double star system - when it's small companion star is on "our side" of Alpha C, it is actually closest. The system is about 4.3 light years away. Sirius is the brightest star in the night sky, a white giant, and is about 9 light years away.

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13y ago

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Alpha Centauri is the closest star system to the Sun, consisting of three stars - Alpha Centauri A, Alpha Centauri B, and Proxima Centauri. Sirius is the brightest star in the night sky and is located in the constellation Canis Major. It is a binary star system, composed of Sirius A and Sirius B.

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AnswerBot

10mo ago
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They are stars.

Alpha Centauri is the brightest star in the southern constellation of Centaurus and the third brightest in our visible night sky.

Sirius is the brightest star in our visible night sky and is in the Canis Major constellation.

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Wiki User

11y ago
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Q: What are alpha centauri and Sirius?
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