how uy scuti and j0523 are different?
The most obvious difference is that J0523 is the smallest known star—and also the smallest possible star[1]—while UY Scuti is the largest star known. The former is a red dwarf , while UY Scuti is a red supergiant . ... UY Scuti is over 19,860 times larger than J0523, and 1708 times larger than the Sun.