VY Canis Majoris
VY Canis Majoris is 1,420 times bigger than the Sun. If placed at the center of the Solar System (where the Sun is), VY Canis Majoris's surface would extend beyond Jupiter's orbit. However, there is some differences in the estimates of how big it is. Other estimates of the radius made it bigger than the orbit of Saturn or even as small as the asteroid belt, but these are highly unlikely.