The oddly shaped object that came whizzing past the Sun and Earth in 2017 on a trajectory from outside our Solar System prompted wild speculation. Most scientists think the cigar-shaped visitor, less than 1 kilometer long, was a comet or asteroid from a nearby star or some other cosmic flotsam. But theoretical astrophysicist Avi Loeb of Harvard University argued that ‘Oumuamua, Hawaiian for “scout,” was an alien creation—a light sail, antenna, or even a spaceship. Today he announced a plan to look for more such objects: a philanthropy-backed effort called the Galileo Project.
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