Mysterious little red dots threatened to overhaul modern cosmology—but new research may have solved the celestial conundrum.

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.

The Copernican principle states that the Earth is not in a special place in the Universe. Us humans are not privileged ...

New research suggests that dark energy isn't needed to explain the acceleration in the expansion of the universe — instead ...

"The Hubble tension is now a Hubble crisis." The mystery of the Hubble tension has deepened with the startling finding that ...

Across cosmic history, powerful forces have acted on matter, reshaping the universe into an increasingly complex web of ...

The Veil Nebula is a cloud of heated and ionized gas and dust in the constellation Cygnus. This image is captured by Hubble Space Telescope. V838 Monocerotis is a cataclysmic binary star in the ...

A "cosmic CT scan" performed by scientists using two very different cosmic surveys has revealed the cosmos is less clumpy and ...

However, one competing theory known as “timescape cosmology” suggests that many observations can be explained by differences in how time flows between dense regions of the universe (such as ...

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 ...

A new computational method gleans more information than its predecessors from maps showing how galaxies are clustered and threaded throughout the universe.