“The first galaxies in the early universe may illuminate what type of dark matter we have today,” says Mark Vogelsberger, associate professor of physics in MIT’s Kavli Institute for Astrophysics and Space Research. “Either we see this filament pattern, and fuzzy dark matter is plausible, or we don’t, and we can rule that model out. We now have a blueprint for how to do this.”
New theories of the enduring dark matter mystery range from planet-sized particles to dark-matter life. One of the primary qualities of dark matter –emitting neither light nor any other known kind of radiation–is that it only interacts with other matter via gravity: it carries no electromagnetic charge. Dark matter is also “dark” because it is mysterious: not composed of atoms or their usual constituents like electrons and protons.