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12-02-22 astronomers using nasa's chandra x-ray observatory have clocked the fastest wind yet discovered blowing off a disk around a stellar-mass black hole. this result has important implications for understanding how this type of black hole behaves. the re...
10-06-04 chinese researchers have successfully built an electromagnetic(电磁的) absorbing(吸引人的) device for microwave frequencies. the device, made of a thin cylinder(汽缸,圆筒) comprising 60 concentric rings of metamaterials(材料) , is capable o...