For decades, scientists have been chasing one of the greatest mysteries of modern science—dark matter. We know it exists. We know it makes up a large portion of the universe. But surprisingly, we still don’t know what it actually is. Now, a new study published in the Journal of Cosmology and Astroparticle Physics proposes a bold and exciting idea: what if dark matter doesn’t come in just one form, but two? This simple question could completely change how scientists search for it—and how they interpret the signals they observe in space. The Mystery of Dark Matter Dark matter is invisible. It doesn’t emit, absorb, or reflect light, which makes it impossible to see directly. Scientists only know it exists because of its gravitational effects on galaxies and stars. For example, galaxies rotate much faster than they should based on visible matter alone. Something unseen must be adding extra mass—and that “something” is what we call dark matter. For years, researchers have tried to detect da...