The discovery of stars orbiting the supermassive black hole at the galactic center was a turning point in astrophysics.
发现恒星围绕银河系中心的超大质量黑洞运行是天体物理学的一个转折点。
Deep into that darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before.