M101 - Definition and Overview

The Pinwheel Galaxy (also known as Messier Object 101, M101, or NGC 5457) is a spiral galaxy in the Ursa Major constellation. M101 is the brightest member of the M101 group of galaxies.

Related topics

• List of messier objects
• New General Catalogue
• Wikipedia Project: Astronomical Objects

External links

• Messier 101, SEDS Messier pages (http://www.seds.org/messier/m/m101.html)

See also

• Southern Pinwheel Galaxy