How big can the stars in the universe be?

While dwarf stars are only about as big as a planet, other supergiant stars may be 1,400 times larger than the Sun. For example, super-giant Vy Canis Majoris has a diameter of up to 2 billion km.

Stars in the universe are very different in size. While dwarf stars are only about as big as a planet, other supergiant stars may be 1,400 times larger than the Sun. For example, super-giant Vy Canis Majoris has a diameter of up to 2 billion km.