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Alpha Centauri

Alpha Centauri is a star system in the southern constellation of Centaurus, consisting of three stars. The two brightest components, Alpha Centauri A and B, form a binary pair that appear as a single bright star to the naked eye—the third-brightest star in the entire night sky. The third component, Proxima Centauri, is a small red dwarf that happens to be the closest star to our Sun at 4.2465 light-years away. This makes Alpha Centauri important because it is our nearest stellar neighbor, offering the most accessible target for future space exploration and providing a natural laboratory for studying nearby stellar systems and potentially habitable worlds like Proxima b.

Sources

• en.wikipedia.org: “Alpha Centauri (α Centauri, α Cen, or Alpha Cen) is a star system in the southern constellation of Centaurus. It consists of three stars: Rigil Kentaurus (Alpha Centauri A), Toliman (Alpha Centauri B), and Proxima Centauri (Alpha Centauri C).”
• en.wikipedia.org: “Proxima Centauri is the closest star to the Sun at 4.2465 light-years (ly)”
• en.wikipedia.org: “To the naked eye, these two main components appear to be a single star with an apparent magnitude of −0.27. It is the brightest star in the constellation and the third-brightest in the night sky”
• images.nasa.gov: “The closest star system to the Earth is the famous Alpha Centauri group. Located in the constellation of Centaurus (The Centaur), at a distance of 4.3 light-years, this system is made up of the binary formed by the stars Alpha Centauri A and Alpha Centauri B, plus the faint red dwarf Alpha Centauri C, also known as Proxima Centauri.”