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。
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。
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