Don’t worry, the expansion of the universe is still accelerating

In the early 1900s, Edwin Hubble observed that distant galaxies are moving away from us. This surprising observation led Hubble to hypothesize that the universe is expanding; more recently, scientists have observed that not only is the universe expanding, but that the expansion is accelerating! The evidence for acceleration emerged from observations of a particular kind of supernovae (Type Ia supernovae) that have a uniform … Continue reading Don’t worry, the expansion of the universe is still accelerating

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

Dark Matter Evades the World’s Most Sensitive Search

At the 11th Identification of Dark Matter Conference, LUX, the Large Underground Xenon experiment, announced the results of the world’s most sensitive search for dark matter. Physicists at LUX have been racing for a dark matter discovery since the collaboration’s inception. Observers in the field were aware that the LUX announcement would include more data with vastly improved performance compared to experiment’s initial run in … Continue reading Dark Matter Evades the World’s Most Sensitive Search