Astronomers have been confounded by recent evidence that the universe expanded at different rates throughout its life. New findings risk turning the tension into a crisis, scientists say.

"This is saying, to some respect, that our model of cosmology might be broken." There are two gold-standard methods for working out the Hubble constant — the value that quantifies the speed of ...

Observations from the James Webb Space Telescope reveal monster black holes in the early universe that seem to have grown too ...

Computer algorithms can model the universe, matching simulations to observations and revealing the distribution of dark ...

In the vast and enigmatic realm of quantum mechanics, where the rules of classical physics give way to probabilities and ...

Could time itself actually explain our universe's expansion? Our current cosmological model—known as lambda cold dark matter, or ΛCDM—relies on hypothesized dark energy to explain the accelerating ...

the standard model of cosmology, or the Lambda Cold Dark Matter (LCDM) model. "This discovery poses a challenge to the LCDM model, as it may struggle to account for the formation of such small ...