Here are the top contenders, depending on how you define "largest":
* By radius: The current record holder for largest star by radius is UY Scuti, a red supergiant estimated to be 1,700 times the radius of our Sun. This means if you replaced our Sun with UY Scuti, its surface would extend past the orbit of Jupiter!
* By mass: While UY Scuti is massive, it's not the most massive star. That title likely goes to R136a1, a blue supergiant with about 265 times the mass of our Sun. However, it's much denser than UY Scuti, giving it a smaller radius.
* By volume: Due to its enormous size, UY Scuti wins the title of "largest star by volume". It's so large that its volume is several billion times that of the Sun.
It's important to remember that our understanding of stars is constantly evolving. New discoveries could always reveal even larger stars in the vastness of space!
