SOLAR SYSTEM

Detailed explanation-1: -Supergiants have the largest radius of all known stars. They evolve from large main-sequence stars. Supergiants can contain 8-200 times the mass of the Sun!

Detailed explanation-2: -Supergiant stars are stars that may have the mass of 10 to 70 stars, any more than that and it is rather unstable and often explodes into a supernova. In terms of mass, a galaxy, no matter how small would be more massive than a supergiant star. In terms of size a galaxy would still be larger than a supergiant star.

Detailed explanation-3: -Some examples of red supergiants are Antares, Betelgeuse, and Mu Cephei. Some examples of blue supergiants are Rigel, UW Canis Majoris, and Tau Canis Majoris.

Detailed explanation-4: -Giant stars have radii up to a few hundred times the Sun and luminosities between 10 and a few thousand times that of the Sun. Stars still more luminous than giants are referred to as supergiants and hypergiants.

Detailed explanation-5: -While red supergiants are the largest stars, each with a radius between 200 and 800 times the radius of our Sun, blue supergiants are decidedly smaller. Most are less than 25 solar radii. However, they have been found, in many cases, to be some of the most massive in the universe.