Bumping along a dirt track in New Mexico, something alien rises above the expanse of brush. It looks like a flying saucer on its side, a huge circle 4 metres taller than the Statue of Liberty. This is SpinLaunch’s suborbital accelerator, a colossal centrifuge built to practice throwing satellites into space. It seems like a wild idea, but it just might work, as I saw when I watched the company’s ninth test flight.
SpinLaunch started in California in 2014 with the goal…