“M51”造句，怎麼用M51造句

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).

也許旋渦星系M51原本是一個巨大的星系，直徑超過6萬光年，有顯爾易見的旋渦結構。