Seeing the Invisible: A short history of the scientific evidence of dark matter

by Sasha Brownsberger figures by Abagail Burrus Everything you have ever touched, seen, or tasted; the air you breathe; the ground on which you stand; and the constituents of your body all consist of a type of matter that is only a fraction of all that is. In light of a series of unexpected discoveries over the past half century, astronomers and physicists have determined … Continue reading Seeing the Invisible: A short history of the scientific evidence of dark matter

Galactic Rotation Curves Revisited: A Surprise For Dark Matter

Historically, galactic rotation curves have suggested that galaxies are surrounded by a vast amount of invisible matter, otherwise known as a dark matter halo. A few weeks ago, a team of astrophysicists published a result that completely contradicts these halo models and could even change the popular understanding of dark matter. The team found that galactic rotation curves can be calculated explicitly from a simple … Continue reading Galactic Rotation Curves Revisited: A Surprise For Dark Matter

Discovery of a Dark Matter Galaxy

Last week, astronomers announced the discovery of a galaxy that is almost entirely comprised of dark matter. At first glance, the galaxy, Dragonfly 44, is roughly the same size as the Milky Way, but only contains 1 percent as many stars. Naively, one would expect this galaxy to be torn apart by its surroundings in the Coma Cluster. However, Dragonfly 44 is composed of 99.99% … Continue reading Discovery of a Dark Matter Galaxy