A star’s mass is described relative to the mass of the sun, which is 1.98892 × 1030 kilograms. The smallest stars, known as red dwarf stars, have less than 50% the mass of the sun and can be as little as 7.5% (7.5% of the sun’s mass is equal to 80 times the mass of Jupiter). The largest stars are called supergiants and hypergiants. Rigel, the brightest star in the constellation Orion, has 17 times the mass of the sun. The blue hypergiant Eta Carinae, located 8,000 light-years away, has 150 times the mass of the sun.
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