(M101, NGC 5457)
(easily-observed spiral galaxy)
The Pinwheel Galaxy (M101, Messier 101,
or NGC 5457)
is a spiral galaxy about
21 million light-years distant that is oriented
moderately close to perpendicular to the line of sight,
i.e., so the spiral is fully in view.
It is classified as a grand design spiral galaxy,
i.e., showing a very clear spiral structure.
Recent Type Ia supernova, SN 2011fe,
was in M101.
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