Also known as the Pinwheel Galaxy, M101 lies within the boundaries of the northern constellation Ursa Major, about 25 million light-years away.
M101也被称为风车星系，位于大约2500万光年之遥的大熊星座北部边缘。
Also known as the Pinwheel Galaxy, M101 lies within the boundaries of the northern constellation Ursa Major, about 25 million light-years away.
M101也被称为风车星系，位于大约2500万光年之遥的大熊星座北部边缘。
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