A faraway star's mysterous and dramatic dimming was most likely caused by comet fragments, a new study suggests -- though it doesn't rule out the much-ballyhooed possibility of an "alien megastructure" in the system.
A faraway star's mysterous and dramatic dimming was most likely caused by comet fragments, a new study suggests -- though it doesn't rule out the much-ballyhooed possibility of an "alien megastructure" in the system.
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