The European Space Agency has put together a huge hires picture of M101, the Pinwheel Galaxy composed of 51 images taken by the Hubble Space Telescope. The detail is stunning in this 12000 pixel by 15000 pixel image. The full size JPG file is 65mb while the original TIFF image is a whopping 450mb!! They do have smaller file sizes availabe for the faint of heart.

You can find the image here and do a little space exploration of your own: http://www.spacetelescope.org/images...heic0602a.html

Enjoy!