It’s always amazing, and more than a little humbling, when the universe reminds us that our “common sense” is provincial, ...

The James Webb Space Telescope has spotted some of the earliest and most distant galaxies, but how can we be sure these early galaxies aren't closer and more recent? When you purchase through links on ...

Physicists have improved the accuracy of a technique that uses variable stars to measure distances in the universe, providing a new figure for its expansion rate. When you purchase through links on ...

An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be ...

There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Astronomers have ...

ESO-VLT and ESA XMM-Newton together discover earliest massive cluster of galaxies known Combining observations with ESO’s Very Large Telescope and ESA’s XMM-Newton X-ray observatory, astronomers have ...

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New observations from the James Webb Space Telescope suggest that a new feature in the universe—not a flaw in telescope measurements—may be behind the decadelong mystery of why the universe is ...