Haste makes waste, and you have to move awfully fast to break out of Earths atmosphere. After today, however, space travel might be a tad more sustainable. SpaceX is testing a new, reusable version of its Falcon 9 rocket today. The test is tacked on to the companys regularly scheduled cargo mission, which carts supplies to the International Space Station — but todays capsule will be pushed into orbit by a modified rocket featuring four large landing legs.