ROWN DWARFS BLOW TOPS: Long thought to be silent, brown dwarfshave emerged in recent years as sources of strong lighthouse–like radiobeams. The emissions, which may help researchers understand morepowerful signals from pulsars, seem to be emanating from the dwarfs'magnetic poles, amplified in a mechanism similar to one that occurs onplanets such as Earth and Jupiter, researchers reported this week at ameeting of the Royal Astronomical Society.
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