M33, the Triangulum Galaxy
A spiral galaxy located approximately 2.73 million light-years away from Earth in the constellation Triangulum, M33 aka the Triangulum Galaxy has a diameter of 18.74 kiloparsecs (61,100 light-years).
It forms the third galaxy in the Local Group - including the Milky Way and Andromeda of which the M33 is a satellite.
The Triangulum Galaxy is also notable for having an H II nucleus at its core.
Under exceptionally clear and dark conditions, some individuals with fully dark-adapted eyes can see the Triangulum Galaxy (apparent magnitude 5.6, effective visual magnitude 6.6) without the aid of telescopes or binoculars, making it the farthest permanent object visible without magnification.
It forms the third galaxy in the Local Group - including the Milky Way and Andromeda of which the M33 is a satellite.
The Triangulum Galaxy is also notable for having an H II nucleus at its core.
Under exceptionally clear and dark conditions, some individuals with fully dark-adapted eyes can see the Triangulum Galaxy (apparent magnitude 5.6, effective visual magnitude 6.6) without the aid of telescopes or binoculars, making it the farthest permanent object visible without magnification.
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