Star_scaleOne of my favorite videos is the march of stars which I posted on 10/3/2008 showing the size scale of the largest stars. It boggles the mind just how large these suns are.

For example, the largest known star, VY Canis Majoris (VY CMa), is 2,100 solar radii, or 2,100 times the size of the Sun. To take this in perspective, if VY CMa replace the Sun, its diameter would extend out to Saturn’s orbit — 890,700,000 miles (1,433,449,370 km).  It takes light 80 minutes to travel that far!

Speaking of far — the farthest know object, a  massive cluster of galaxies called Abell 2218, is 13 billion light years away. The image that we see of these galaxies are 13 billion years old! These size scales are virtually impossible to visualize!