CosmologyOctober 15, 2024
A Weird Form of Dark Energy Might Solve a Cosmic Conundrum
Estimates of how fast the universe is expanding disagree. Could a new form of dark energy resolve the problem?
Stories by Adam G. Riess
Adam G. Riess is an astrophysicist at Johns Hopkins University and the Space Telescope Science Institute. His research on distant supernovae revealed that the expansion of the universe is accelerating, a discovery for which he shared the 2011 Nobel Prize in Physics.
The SciencesOctober 26, 2016
No, Astronomers Haven't Decided Dark Energy Is Nonexistent
You might have read otherwise in some headlines lately, but don't be misled
Space & PhysicsMarch 1, 2016
Dark Energy: No Answers but More Questions
Why is the expansion of the universe accelerating? After two decades of study, the answer is as mysterious as ever, but the questions have become clearer
Space & PhysicsSeptember 23, 2008
The Expanding Universe: From Slowdown to Speed Up
Distant supernovae are revealing the crucial time when the expansion of the universe changed from decelerating to accelerating