Expansion of the Universe

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Photos show that comet C/2025 F2 (SWAN) experienced a "major eruption," causing it to become temporarily brighter. However, it's still unclear whether the icy object is a true "cryovolcano."

A new estimate of the ghostly particle's maximum possible mass brings physicists a tad closer to understanding the universe.

A long-simmering disagreement over the universe's present-day expansion rate shows no signs of resolution, leaving experts increasingly vexed

A new map of cosmic expansion suggests that dark energy evolves over time, hinting that the universe doesn't work the way we thought it did

Researchers say dark energy may be ebbing, raising possibility of a 'Big Crunch'

New data further challenge the best scientific theory of the history and the structure of the universe. But a separate recent result reinforces it.

Black holes may transition into white holes, ejecting matter and even time back into the Universe, according to a new study by physicists from the University of Sheffield and the Universidad Complutense de Madrid.

NASA's SPHEREx observatory (short for Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer) is set to launch this week to map 450 million galaxies in infrared, providing insights into galaxy formation, the origins of water, and testing theories about the unive...

While normal matter makes up all the things we've ever directly detected and interacted with, including atoms, gas, dust, plasma, stars, planets, black holes, neutrinos, light, and even gravitational…

But one group of researchers may have just cracked why they do.

The riddle of dark matter, which is thought to make up much of the universe, may be solved at last.

For humans, the most important star in the universe is our Sun. The second-most important star is nestled inside the Andromeda galaxy. Don't go looking for it — the flickering star is 2.2 million light-years away, and is 1/100,000th the brightness of the faintest star visible to the human eye. Yet, a century ago, its […]

Dark energy -- an unknown energy source that is causing our Universe's expansion to accelerate – doesn't actually exist, according to new research.

MIT Haystack Observatory researchers and citizen-scientists collaborated to map the total electron content of the 2024 aurora over North America.

A new study suggests there might be a way to prove the notorious Anthropic Principle false.

The largest survey of our universe ever conducted suggests that it closely matches the model most favored by cosmologists. It's unclear what this means for alternative theories attempting to explain bizarre discrepancies.

There's increasing evidence that astronomical theories don't match the observations. Is it time to rethink our story of how our universe came to be? The post MOND and more. Does the universe need a rethink? first appeared on EarthSky.

How did supermassive black holes get big so fast? Astrophysicist Souphie Koudmani tells us how she and her colleagues are finding out.

The space telescope will detect over 100 colors from hundreds of millions of stars and galaxies. Here's what astronomers will do with all that color.