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Proplyd 181−247, which is a brown dwarf or low-mass star, is surrounded by a disk with a radius of 30 astronomical units and the disk has a mass of 6.2±1.0 M J. [142] Disks around brown dwarfs usually have a radius smaller than 40 astronomical units , but three disks in the more distant Taurus molecular cloud have a radius larger than 70 au ...