'It's about expanding Earth': could we build cities in space?
During the early weeks of his 167-day stint aboard the International Space Station in 2014, astronaut Barry “Butch” Wilmore noticed that a torque wrench was missing. “It’s not uncommon for things to disappear in space,” he tells me over the phone from the Johnson Space Center in Houston. “You just don’t have gravity keeping stuff in place.” Wilmore mentioned the missing tool to Nasa’s mission control as he was tending to a 3D printer, a microwave-sized box that extrudes heated plastic to...
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