The Largest Stars in the Universes The largest known stars in the Universe. VY Canis Majoris (VY CMa) is a red hypergiant star located in the constellation Canis Major. With a size of 2600 solar radii, it is the largest known star and also one of the most luminous known. But there might just bigger stars than VY Canis Majoris such as UY Scuti (9,500 light years away from Earth), which is one of the leading candidates for being the largest known star by radius and is also one of the most luminous

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Stephenson 2-18 (also known as St2-18 or Stephenson 218) ranks among the largest known stars in the universe. This colossal red supergiant is situated in the constellation Scutum, roughly 19,000 light-years away from Earth. Its estimated radius is about 2,150 times that of the Sun—so immense that if placed at the center of our solar system, its surface would stretch past the orbit of Saturn. Despite its size, Stephenson 2-18 is relatively cool, with a surface temperature of around 3,200 K, which