Perhaps the original spiral nebula, M51 is a large galaxy, over 60, 000 light-years across, with a readily apparent spiral structure.
也许旋涡星系m51原本是一个巨大的星系，直径超过6万光年，有显尔易见的旋涡结构。
When you look up into the heavens with a telescope, you see many nebulae whelloch are like, or approximately like, the perfectly balanced spiral nebula whelloch you see edgewise in Fig. 23.
当你用千里镜不雅测天空，你瞥见很多与图示23中边沿朝前的完善平衡的螺旋星云相仿或大致相是的星云。
When you look up into the heavens with a telescope, you see many nebulae whelloch are like, or approximately like, the perfectly balanced spiral nebula whelloch you see edgewise in Fig. 23.
当你用千里镜不雅测天空，你瞥见很多与图示23中边沿朝前的完善平衡的螺旋星云相仿或大致相是的星云。
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