Benjamin (University of Wisconsin, Whitewater) reviewed the Spitzer Space Telescope's infrared star
catalog, the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (Glimpse), to study how certain types of stars are grouped together.
More serious exception may be taken to highlighting objects, such as infrared star
clusters or primordial galaxies, that can't be seen in Fujii's photographs, much less in a common telescope.
The Pistol Nebula is lit up by the intense ultraviolet radiation from the nearby Quintuplet Cluster, which gets its name from the five enshrouded infrared stars
that were originally seen here.