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“Either one of our refutations has some hidden loophole, or some theorist needs to come up with some other proposal,” Bradley Schaefer, an astronomer at Louisiana State University, told the New Scientist. “The comet-family idea was reasonably put forth as the best of the proposals, even while acknowledging that they all were a poor lot. But now we have a refutation of the idea, and indeed, of all published ideas.”