A new study casts doubt on the universe’s accelerating expansion, suggesting dark energy might be weakening over time.

An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be ...

Will the universe keep existing forever? An astrophysicist explains how scientists aren’t entirely sure, but they can make ...

Scientists have many big questions to tackle about the universe, including how big it actually is. But even the proposed ...

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, good ol' Earth helps us understand what the universe might be doing beyond ...

The universe is expanding. That much is clearer. But it’s less clear whether this expansion is accelerating or slowing down.

The expansion rate of the universe may be slowing down, rather than accelerating at an ever-growing rate, a potentially groundbreaking new study has hinted. The suggestion challenges both the 2011 ...

As if dark energy weren't already mysterious and baffling enough, new research suggests that this unknown force may not be driving galaxies apart at an accelerating rate anymore. This remarkable ...

Discover how JWST's groundbreaking observations of the oldest galaxies reveal new insights into early galaxies discovery and transform our understanding of galaxy formation.

That's the case for a galaxy described in a new paper by PhD student Sijia Cai of Tsinghua University's Department of ...