For the first time, a used SpaceX rocket booster has flown again. On March 30, the first stage of a Falcon 9 rocket sent its second payload into space, after having launched and landed in April 2016. The achievement is an important milestone in the company's road to creating a reusable launch system—and a feat that's 15 years in the making. The launch and subsequent landing on a drone ship proves, as SpaceX CEO Elon Musk noted, "you can fly and re-fly an orbit-class booster." The private spaceflight company estimates that by reusing its liftoff boosters rather than tossing them away in the sea, it can slash launch costs by about 30 percent, providing cheap(er) access to the final frontier. But the dream of reusing rockets on a regular basis isn't quite here yet. Ten days ago, in an email about rocket engine bearings, Jeff Bezos—founder of Blue Origin, a company that has also successfully reused its own rocket, albeit without reaching orbit or carrying a payload—underlined the challenges that lie ahead: If 'reusability' requires significant refurbishment, inspection, and re-validation between flights, then it simply won’t lead to the far lower launch costs we need to achieve our vision of millions of people living and working in space. Indeed, Musk now has set his sights on making the refurbishment process faster. "Rapid reusability of rockets is the key to opening up space," he said during a press conference after the launch. "We need to get really efficient with the reuse of the booster and the fairing." Almost a full year has gone by since the reused SpaceX booster first flew. Granted, a rocket explosion kept the Falcon 9 grounded for several months. Plus, this was a first for the company—and for spaceflight in general—so it makes sense that they might have taken extra precautions before attempting to re-launch it. If it turns out the boosters need a significant overhaul after launch and landing, that could really put a damper on the reusable rocket discount. But so far, so good. SpaceX's first recovered booster, which landed on solid ground and now sits as a monument outside the company's headquarters, was reportedly in good shape after its homecoming, more or less fit to fly again. Read More: Popular Science
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