Our Universe

[Maddolis]

I used 1950 Solar radii (1950 * ), not 1950 AU.
= 0.004652 AU.
VY Canis Majoris is 19 AU in diameter (on average), or 1800-2100 Solar Radii (as is the most widely accepted size).

= The radius of the sun;
hence the radius of VY CMa =~1950*radius of the sun;
hence the diameter of VY CMa =~1950*diameter of the sun.

Let the diameter of the sun = 11mm;
hence Diameter of VY CMa = 1950*11mm = 21450mm
=2145cm
=214.5 metres


You were just using the wrong unit, whether or not the calculations from that point on were correct or not.