M51造句怎么写

Perhaps the original spiral nebula, M51 is a large galaxy, over 60, 000 light-years across, with a readily apparent spiral structure.

Explanation: One of the brightest supernovas in recent years has just been recorded in the nearby Whirlpool galaxy (M51).

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。