Neutron stars are some of the weirdest cosmic objects, and the greatest mysteries lie deep in their hearts.

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

Scientists say it's the earliest galaxy seen doing this (so far). Astronomers have caught an immensely ancient galaxy ...

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

In simplest terms, the rate at which the universe expands on paper doesn’t match actual astronomical observations. That speed ...

Cosmologist Katie Mack breaks down what the latest findings about dark energy mean for our universe’s future. Either way, it ...

New research suggests that the largest cosmic structure is even bigger and closer to Earth than we knew. It goes against ...

These series of step-like bursts happen so rapidly that they are difficult to observe as these singularities wink in and out ...

New three-dimensional (3D) models of objects in space have been released by NASA's Chandra X-ray Observatory. These 3D models ...

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

By mapping the brightest explosions in the universe, scientists may have uncovered a megastructure that defies our ...