As an expert in astronomy, I can tell you that the concept of the "biggest" star can be interpreted in different ways, such as by mass, volume, or brightness. However, when we talk about the largest stars in terms of volume, we often refer to red supergiants. The largest known star in this category is UY Scuti, which is a red supergiant with a radius estimated to be about 1,700 times that of our Sun. It is so large that if you replaced our Sun with UY Scuti, it could extend beyond the orbit of Jupiter.

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Following this discovery, UY Scuti was officially named the largest known star in the galaxy, surpassing previous record holders such as Betelgeuse, VY Canis Majoris, and NML Cygni.read more >>