There are many ways to answer this question, but here are the top 10 biggest stars according to their mass and radius:
1. Betelgeuse - This red supergiant is one of the largest stars known, with a diameter about 1,400 times that of our Sun. It is also one of the closest stars to us at only 640 light years away.
2. VY Canis Majoris - This star is even larger than Betelgeuse, with a diameter estimated to be about 2,100 times that of our Sun. It is however much further away from us at around 3,900 light years.
3. Mu Cephei - Also known as Herschel's Garnet Star, Mu Cephei is a bright red giant with a diameter around 1,500 times that of our Sun. It lies approximately 3,800 light years from Earth.
4.KW Sagittarii - KW Sagittarii is another red giant star with a diameter around 1,300 times that of our Sun.
It can be found in the constellation Sagittarius and lies around 4,200 light years from Earth.
5.V766 Centauri - V766 Centauri is yet another red giant star with an impressive diameter of 1,200 solar diameters.
This star can be found in the constellation Centaurus and lies approximately 4500 light years from Earth.