Diamond dust shimmering around distant stars

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(Green Bank Observatory) Some of the tiniest diamonds in the universe — bits of crystalline carbon hundreds of thousands of times smaller than a grain of sand — have been detected swirling around three infant star systems in the Milky Way. These microscopic gemstones are neither rare nor precious; they are, however, exciting for astronomers who identified them as the source of a mysterious cosmic microwave 'glow' emanating from several protoplanetary disks in our galaxy.

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