A star is a body similar to the Sun, which shines thanks to nuclear reactions which occur in its center. The nearest star is a red dwarf, Proxima Centauri (Alpha Centauri C), located about 4 light years from the Solar System, nearly 250,000 times farther than the Sun. Sirius is a binary system made up of 2 stars, Sirius A and Sirius B located in the constellation Canis Major. The star Sirius A (α Canis Majoris) is the brightest star in the sky. Betelgeuse is a red super giant, its radius is estimated to be around 900 times that of the Sun.
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