black hole-凯发k8官网

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...