When it comes to rockets, size matters, and Elon Musk and Jeff Bezos know it. The two billionaire entrepreneurs both own their own spaceflight companies.
Musk's SpaceX is currently using its large Falcon 9 rocket to fly large payloads to orbit for NASA and companies around the world, while Bezos's Blue Origin is testing out its New Shepard rocket designed to fly humans on suborbital flights to the edge of space.
Image: http://mashable.com
