The earliest light in the universe has been traveling across space since just after the Big Bang. Known as the cosmic ...

The team used the Multi-Unit Spectroscopic Explorer (MUSE) on the European Southern Observatory’s Very Large Telescope in ...

The Bullet Cluster, named for its distinctive shape, has long been considered a smoking gun for the existence of dark matter ...

You could swim through the deepest voids and encounter a single hydrogen atom in an entire football field's worth of space.

These cosmic filaments contain 12 trillion solar masses of 10-million-degree gas, helping solve the "missing matter" mystery.

A ground telescope in Chile detected cosmic polarization signals, confirming the universe’s first stars' timeline.

For years, scientists have worked to chart the universe’s massive structure, aiming to test key models of cosmology. These ...

New measurements of the universe’s expansion using James Webb Space Telescope appear to resolve the Hubble constant conflict ...

For the first time, astronomers have used a ground-based telescope to observe polarized microwave light from the universe's earliest epoch. Their observations could give them a better understanding of ...

The cosmic microwave background is the oldest light in the Universe, emitted about 380,000 years after the Big Bang. It corresponds to the moment when the Universe became cool enough for electrons and ...

Dark matter is a real pain in the neck. The term dark matter itself refers to a hypothetical substance that seems to solely ...