In the grand puzzle of the cosmos, one question continues to defy easy answers: how fast is the universe expanding?

Our sun, like all stars, is made mostly of hydrogen and helium. They are by far the most abundant elements, formed in the ...

For the first time in history, we can explore the universe through a rich blend of senses—seeing, touching, and hearing ...

A new study suggests the universe may rotate -- just extremely slowly. The finding could help solve one of astronomy's biggest puzzles.

The potential finds could be contributing to some of the faintest light we can see in the universe, say researchers.

The universe doesn't come with an instruction manual—but if it did, University of Missouri Assistant Professor Charles ...

A new model of the cosmos does away with the universe's two most troubling and ... what we see around us on a day-to-day basis in stars, planets, moons, our bodies — and everything else, really.

Our current best theories of the universe suggest that dark energy is making it expand faster and faster, but new ...

The most distant and earliest "dead" massive galaxy ever seen shows some galaxies lived fast and died young shortly after the ...

A project to map galaxies across the universe may have spied cracks in the foundation of our understanding of the cosmos.

In recent years, one of the most troubling puzzles in astrophysics has grown more urgent. Scientists have realized that the ...