Astronomers have spotted an interstellar comet older than the Sun
Its appearance puts a new branch of astronomy to the test
ON THE NIGHT of July 1st, in a remote corner of Chile, a small robotic telescope noticed something moving in the sky. What at first seemed a routine detection of an object travelling through the solar system soon turned out to be anything but. The object’s trajectory revealed it to be a much rarer visitor than first thought. Formed around a distant star elsewhere in the Milky Way, it is an interstellar wanderer, not a merely interplanetary one.
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This article appeared in the Science & technology section of the print edition under the headline “Flying visit”
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