Check this out:

This is an image of the 'Pinwheel' galaxy (Messier 101), taken by the Hubble Space Telescope.  (Actually, it is a composite of 51 separate images of this galaxy that were taken by the Hubble.)  The Pinwheel Galaxy is believed to contain something on the order of 1 trillion stars, and has several active star forming regions.  More info and the full set of pics from the Hubble can be found here.

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