Mystery Glow of Dark Matter Halos Fueled by Extragalactic Stars | Space.com

Instead, the researchers suggest wandering stars in the gargantuan spherical halos of dark matter enveloping their home galaxies might be responsible for this mysterious light. Physicists think invisible, as-yet-unidentified dark matter makes up about 85 percent of all matter in the universe.

"These diffuse stripped halo stars explain the missing infrared glow," Cooray said.