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 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 ...

Over the past decade, cosmology has been embroiled in a growing crisis. Fuelling it are observations, first made by the Hubble Space Telescope and later by the James Webb Space Telescope ...

The team behind these findings used the sixth and final data release from the Atacama Cosmology Telescope (ACT) in combination with Year 1 data from ... akin to stacking ancient cosmic photographs ...