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

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 ...

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

If you look across space with a telescope, you'll see countless galaxies, most of which host large central black holes, ...

A giant rotating filament of the cosmic web may be the largest spinning structure ever seen, and could help reveal how ...

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

The galaxy's discovery challenges our understanding of how galaxies were formed in the early period after the Big Bang.

Type Ia supernovae are stellar explosions used to measure the universe's expansion. These explosions result from white dwarfs exceeding a critical mass, causing them to reignite and explode. Two ...

"It means cleaning house, narrowing the viable paths forward, and no longer spending energy on what are evidently dead ends." ...