Pinwheel Galaxy
۱٫۷ × 1021 m
When this galaxy was first discovered, it was believed to be a nebula. It's not; it's a galaxy. It's also called Messier 101, because it was the 101st Messier object to be catalogued.
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×۱٫۷ × 1021 m
When this galaxy was first discovered, it was believed to be a nebula. It's not; it's a galaxy. It's also called Messier 101, because it was the 101st Messier object to be catalogued.