Dark matter, widely known as the universe's most mysterious stuff, is rarer on Earth than gold — and that's despite the fact that dark matter outweighs "ordinary matter" by a staggering ratio of five to one.
The finding came courtesy of scientists who propose a novel way to map dark matter using the "wobble" of the Milky Way. That wobble is due to the influence of the Milky Way's satellite galaxies, like the Large Magellanic Cloud (LMC), and rapidly rotating neutron stars, or "pulsars." Fascinatingly, pulsars act like "cosmic lighthouses" in the cosmos, sweeping beams of light across vast distances.
