The standard model for how galaxies formed in the early universe predicted that the James Webb Space Telescope (JWST) would see dim signals from small, primitive galaxies. But data are not confirming ...

A surprisingly mature spiral galaxy named Alaknanda has been spotted just 1.5 billion years after the Big Bang—far earlier ...

How confusing inevitability with reality built decades of paradox. What if general relativity never actually tells us that ...

The galaxy – seen as it appeared when the Universe was just 1.5 billion years old – shows a mature, organised structure at a time when most early galaxies were believed to be irregular and chaotic, ...

Whether the Universe will 'end' at all is not certain, but all evidence suggests it will continue being humanity's cosmic ...

Astronomers have uncovered the most promising evidence yet for the existence of dark stars—giant cosmic objects powered by dark matter, rather than the fusion processes typically seen in stars. These ...

When we think of the Big Bang, we think loud, hot, and bright. But was it followed by a colder, darker shadow? Five-sixths of the universe seems to be made up of a mysterious substance called “dark ...

For millennia, humans have been fascinated by the mysteries of the cosmos. Unlike ancient philosophers imagining the universe’s origins, modern cosmologists use quantitative tools to gain insights ...

In the early universe, moments after the Big Bang and cosmic inflation, clusters of exotic, massive particles could have ...

NASA's James Webb Space Telescope may have detected the universe's oldest Population III stars in galaxy LAP1-B, 13 billion ...

Two fresh ideas are giving scientists new ways to think about how the universe’s hidden mass came to be. Together, they paint a richer picture of dark matter’s origins and how we might still discover ...