NGC 604 (from M33), HST

Full resolution image here.

This data is from the Hubble Legacy Archives.  NGC 604 was discovered by William Herschel in 1784, but it lies in a nearby galaxy, M33, also called the Triangulum Galaxy.  NGC 604 is very bright, and is visible on nearly every image of M33, but the nebula, like the galaxy to which it belongs, lies roughly 2.8 million light years away.  Hubble's clear vision gives us such a close view.  This is not Hubble's most detailed data of this nebula, but it is a set I've not seen before.  This image combines blue, green, H-alpha, and deep red exposures.