This puzzling result makes sense if one assumes that the boundary stars are feeling the gravitational effects of an unseen mass—dark matter—in a halo around the galaxy. Dark matter could also ...

Models indicate that this decrease is the result of the dark matter halo that is exerting the torque being oblate, or ...

the shape and distribution of dark matter in our galaxy. "Because it's a larger sample, we now have a breakthrough,” Chakrabarti said. "We are able to measure the local dark matter density using ...