Spherical Cow

Approximations and assumptions are an essential part of performing calculations in the field of physics.  The longstanding joke of assuming a cow is a sphere of uniform density in a vacuum has been brought to reality here.  Sort of.  Uniform density and placing the cow in a vacuum is up to you.

Print feet down.  The original is quite small, although due to the simple shape, it scales up quite nicely.  It benefits greatly from some paint.