When Virgin Galactic’s (NYSE:SPCE) Sir Richard Branson blasted off into space last weekend, there was no shortage of critics arguing what “space” meant. 50 miles? 100 miles? (If you stacked the naysayers on top of each other, I’m sure you would have reached whatever altitude they desired). Source: 3Dsculptor / Shutterstock.com Sir Branson proved them…