dark matter

The tension, centered around a value for cosmic lumpiness known as S8, could join the Hubble tension in dethroning our best picture of how the universe evolved.

For decades, measurements of the universe's expansion have suggested a disparity known as the Hubble tension, which threatens to break cosmology as we know it. Now, on the eve of its second anniversary, a new finding by the James Webb Space Telescope has only entrenched the mystery.

While hunting for dark matter, astronomers accidentally discovered the first known stellar stream stretching between galaxies. The trail of stars is also the longest ever seen.

If dark matter is made from "dark" versions of the basic building blocks of ordinary matter, the world's largest particle accelerator should be able to pin it down, a new study suggests.

A Milky Way doppleganger discovered in the early universe suggests some key physical ingredient is missing from cosmological models.

Dark matter may come in multiple particles and weights, similar to the ordinary elements on the periodic table, a new theory suggests.

The first images from ESA's dark universe detective Euclid are out, featuring spectacular views of nebulas, distant galaxies and globular clusters of thousands of stars.

Scientists made a twin version of our universe, showing the evolution of all forms of matter and energy, in the biggest cosmological computer simulation to date.