by Jeff Cunningham
A common misconception that we often encounter is that many people think that space is really far away. Others don’t understand the difference between “sub-orbital” and orbital craft, i.e. why we can’t use tourist craft like Virgin Galactic’s SpaceShipTwo to go to Mars, or why SpaceX’s Dragon is similarly a poor match for space tourism.
We could explain at length the basics of orbital mechanics and breaking atmo, but the ever-popular xkcd has already done so more eloquently than we possibly could–and pointed out an eerie coincidence…
Take Back the Sky 