* Size and Color are Related: Larger stars tend to be cooler and emit more red light, while smaller stars are hotter and emit more blue light.

* Exceptions: There are some giant, red stars that are cooler than the Sun, and some small, white dwarf stars that are hotter than the Sun.

So, the answer depends on what you mean by "largest":

* By Mass: The largest stars by mass are blue supergiants, which are incredibly massive and hot.

* By Diameter: The largest stars by diameter are red supergiants, which are cool but incredibly large.

The largest known star by diameter is UY Scuti, a red supergiant that is about 1,700 times the diameter of the Sun.

However, VY Canis Majoris is another contender for the title, with a diameter estimated to be 1,800 times that of the Sun. Both of these stars are massive, cool, and incredibly large.