Most galaxies, like NGCC4414, shine across the spectrum. Dark galaxies remain in shadow. (AURA/STScI/NASA/Public Domain) Galaxies come in many different shapes and sizes, but the basic ingredients seem fairly consistent. There's usually a big black hole at the center, a bunch of stars and gas, and a generous serving of dark matter that helps glue the whole thing together. While dark matter is, well, dark, the stars, gas, and swirling core of heated material stand out with the radiant beauty of a city in the night. However, one newly discovered dwarf galaxy located a mere 94 million light-years away is...