Dark matter makes up 85% of the stuff in the cosmos, but scientists have no idea what it is. On Dark Matter Day (Oct. 31), Space.com invites you to interrogate the suspects.

All this means is that dark matter—whatever it is—may have arrived on the cosmic scene before the universe as we know it emerged.

Bold new theories on "mirror worlds" and how dark matter may have formed - from black hole relics to quantum horizons.

Dark matter was just coming on the cosmic scene. Axions weren’t invented to solve that problem, but physicists very quickly realized that the complex physics of the early Universe could ...

Dark matter, the mysterious substance that makes up roughly 80 percent of all the matter in the universe, may have been forged before our cosmos was even born. Scientists have long theorized as to ...

Now, researchers have presented a new method for measuring these filaments' mass, which could be used to unlock secrets about dark matter and dark energy. At the very largest scales, our universe ...

After almost a century of speculation, proposals and searches for dark matter, physicists now know that it currently comprises about 27% of the universe's mass-energy, with an abundance over five ...

As Apple TV+‘s Palm Royale ends an eventful first season, the streamer’s compelling new series, Dark Matter, begins. Based on Blake Crouch’s popular sci-fi novel of the same name, Dark ...

Ultrafine dark matter, millions of times lighter than electrons, could flow through the cosmos in waves. We might just have an easy way to check for tiny interactions between this dark matter and ...