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Astronomers Have Discovered An Invisible Dark Matter Galaxy

The Atacama Large Millimeter Array (ALMA) has captured an image with subtle distortions. That, in and of itself, is not too terribly interesting; however, these distortions hint at a hidden galaxy—a dark, dwarf galaxy made up mostly of dark matter…dark matter than happens to be one of the two missing pieces of our universe.

The image captured by ALMA showed faint red arcs surrounding a galaxy (shown in blue light below) nearly 4 billion light-years away. The distortions of light are believed to have been caused by the gravitational force from the dwarf dark galaxy behind it.