M33 in Triangulum is a member of our local group of galaxies. It covers an area over 3 times that of the full moon. Although we think of M33 as one object, it actually contains 4 nebulae large enough to have their own NGC numbers and 10 star clouds with their own IC numbers. Nebula NGC 604 at the upper right of the image is one of the largest nebulae known, spanning an astounding 1500 light years.  Exposures: L:R:G:B=360:100:100:100 minutes=15 hours total exposure.

This image was published in the November, 2014 issue of Astronomy Magazine.