Astronomers have puzzled for decades over how massive elliptical galaxies appeared so early in cosmic history. The standard ...

We’ve been told by science that the universe is expanding relentlessly, driven by a mysterious force called dark energy.

The big bang wasn’t the start of everything, but it has been impossible to see what came before. Now a new kind of cosmology is lifting the veil on the beginning of time ...

It's a glimpse into the universe's secret architecture, revealing how even the most subtle cosmic structures orchestrate the grand ballet of creation, guiding the destiny of galaxies across the eons.

A recent study showed that Mars was warm and wet billions of years ago. The finding contrasts with another theory that this era was mainly cold and icy. The result has implications for the idea that ...

This hypothesis has the advantage of explaining why the rings have a lot of ice and little rock, in contrast to models where a moon strayed inside Saturn’s Roche limit and was pulled apart.

Magnetic fields thread through galaxies, stretch across cosmic voids, and shape the behavior of charged particles over millions of light-years. Yet their origin remains one of the most stubborn ...

This enormous chain of hundreds of galaxies—a cosmic filament—is twisting through space 400 million light-years away ...

New data from major dark-energy observatories suggest the universe may not expand forever after all. A Cornell physicist calculates that the cosmos is heading toward a dramatic reversal: after ...