Two extremely bright stars illuminate a greenish mist in this and other images from the new GLIMPSE360 survey. This fog is comprised of hydrogen and carbon compounds called polycyclic aromatic hydrocarbons (PAHs), which are found right here on Earth in sooty vehicle exhaust and on charred grills. In space, PAHs form in the dark clouds that give rise to stars. These molecules provide astronomers a way to visualize the peripheries of gas clouds and study their structures in great detail. PAHs are not actually “green;” a representative color coding in these images lets scientists observe PAHs glow in the infrared light that Spitzer sees, and which is invisible to us. Strange streaks—likely dust grains that lined up with magnetic fields—distort the star in the top left. The fairly close, well-studied star GL 490 gleams in the middle right. The new GLIMPSE360 observations have revealed several small blobby outflows of gas from nearby forming stars, which indicate their youth. (NASA)