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A Russian oligarch, Mark Zuckerberg, and Stephen Hawking walk into a bar… No this isn’t a joke, but a pretty cool space proposal. Their idea is to launch a fleet of laser-propelled “nanocrafts” that would swarm to the nearest star, Alpha Centauri, in a 20-year voyage. It would take about four more years for the mini-probes to transmit photos and readings back to earth.