Ultracool dwarf stars orbit each other in less than a day

Two ultracool dwarf stars in a binary system are the closest ever discovered, orbiting each other in under a day.

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California ,United States ,San Diego ,Chris Theissen ,Chih Chun Dino Hsu ,Adam Burgasser ,Space Sciences ,Uc San Diego Center ,Northwestern University ,California San Diego ,Keck Observatory ,Near Infrared Spectrograph ,Diego Center ,Astrophysical Journal ,