M33
astronomy
Quick Summary
Learn about galaxy clusters, superclusters, and the Local Group
The billions of galaxies in the universe are concentrated in groups called clusters, which may contain thousands of galaxies each.
M33, also known as the Triangulum Galaxy, is one of the closest spiral galaxies to Earth, located approximately 2.8 million light-years away. It is situated within the constellation Triangulum and is visible to the naked eye as a faint, milky blur. M33 is part of the Messier catalog, a list of deep-sky objects compiled by Charles Messier to help distinguish them from comets. While M31, the Andromeda Galaxy, is the nearest large galaxy, M33 is also a significant object for astronomical study.123
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