The image used in our header is a section of a 1,500-square-degree-equal-area Aitoff projection mosaic, computed with Montage, of galactic neutral hydrogen observed with the Arecibo Legacy Fast ALFA Survey (ALFALFA) survey near the North Galactic Pole (NGP). Image courtesy of Dr. Brian Kent and the ALFALFA collaboration.
To view the full image, see the following blog post on the Astronomy Computing Today blog.
Montage Image Mosaic Software 