Rex Parker PhD -- Astrophotography of the Deep Sky (click on panels to open galleries; click on this line to return to top) » Galaxies

Galaxies are massive concentrations of hundreds of millions to billions of stars located well outside our own Milky Way. The shapes range from beautiful helical spirals to centrally barred spirals to spherical halos, as originally described by Edwin Hubble. In some cases, new star-forming H2 regions glow visibly reddish in H-alpha light.