Messier 101 main content.

Messier 101

Part of Scales of the Universe.

Messier-101_HERO AMNH/D. Finnin

If the Hayden Sphere is the size of the Local Group of galaxies, then this model is the relative size of Messier 101.

Messier 101 is a spiral galaxy about 25 percent larger than our Milky Way Galaxy.