Dense clusters of stars embedded within its gas and dust cause parts of the Fly Nebula to glow brightly against its darker background hues.
One of a range of clusters and nebulae in the heart of the Milky Way as it runs through the constellation of Auriga. NGC 1931 is an orb of nebulous material illuminated by a star cluster held within it. The entire structure is about 10 light years across, and it falls some seven thousand light years from the Solar System, in the direction of the the Galaxy's rim. The Fly Nebula lies close by the much larger Spider Nebula (IC 417), and together the two objects are referred to as the Spider and the Fly.
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