The Hubble eXtreme Deep Field (XDF) captures a tiny patch of sky in the Fornax constellation, revealing thousands of galaxies, some over 13 billion years old. This Hubble image captures HH111, a rare ...

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 ...

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 process is like a cosmic CT scan, where we can look through different slices of cosmic history and track how matter clumped together at different epochs." ...

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

The Sky at Night Is Cosmology in Crisis? Your Images: February 2019 Some of our favourites posted on the Sky at Night Flickr page over the past couple of months. Thanks for sharing!

This is likely because the light in these images passes around the opposite ... which threatens to "break" our understanding of cosmology. Researchers refer to this problem as the Hubble tension.