amazing!
University of Minnesota professor Roberta M. Humphreys estimates the radius of VY CMa at 1,800 to 2,100 solar radii. To illustrate, if our Sun were replaced by VY Canis Majoris, its surface might extend to the orbit of Saturn. Assuming the upper size limit of 2100 solar radii, light would take more than 8 hours to travel around the star's circumference, as opposed to 14.5 seconds for the sun. It would take over 7,000,000,000,000,000 (7 Quadrillion) earths to fill VY Canis Majoris. The diameter of VY Canis majoris is Est. 3,063,500,000 km.