Solar sails have some major advantages over traditional propulsion methods - most notably they dont use any propellant. But, how exactly do they turn? In traditional sailing, a ships captain can simply adjust the angle of the sail itself to catch the wind at a different angle. But they also have the added advantage of a rudder, which doesnt work when sailing on light. This has been a long-standing challenge, but a new paper available in pre-print from arXiv, by Gulzhan Aldan and Igor Bargatin at the University of Pennsylvania describes a new technique to turn solar sails - kirigami.
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