Author(s): Alejandro Moreno
Messier 91 (also known as NGC 4548) is an SBb-type barred spiral galaxy about 51.92 million light-years away in the constellation Coma Berenices. It is the last of the eight galaxies that were mistaken for nebulae, of which not until the 1920s when they were determined these objects aren't part of the Milky Way
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