#黑洞# 天上方七日，世上已千年。 黑洞居然如此炫目，宇宙无穷奥妙，人类认知何其渺小，想起小时候夏天躺竹制凉床上看月亮、数星星…… "But where gas takes days to weeks to orbit the larger M87*, in the much smaller Sgr A* it completes an orbit in mere minutes. This means the brightness
