VY Canis Majoris is the largest star found in this universe. If you think that the sun (Called Sol) is the biggest, its not. It's called a yellow dwarf. Those are smaller than pistol stars! Wow!
But for now, imagine a passenger plane flying over the star at 900 km/ph. It would take about 1,100 years to circle this star ONCE!! Earth, compared to it is only the size of a grain of sand! It is in the midst of life, meaning that soon it will die, with a possibly big supernova. If that happens, Mu cephei will be the biggest star in the known universe.