Most of the mass in the Universe is of some unknown form of matter. While we have some guesses what it might be we are not sure. In this talk for a non-specialist audience, Professor Abel will explain how observations using ...

One of the most obvious facts about the universe is that the past is different from the future. We can remember yesterday, but not tomorrow; we can turn an egg into an omelet, but can't turn an omelet into an egg. That's ...

Cosmology studies the universe at the largest scales, applying the laws of physics over billions of light years and all the way back to the universe's infancy. In dozens of groundbreaking publications, Jim Peebles laid the ...