New measurements using gravitational lensing suggest the universe’s current expansion rate does not agree with signals from the early cosmos.

In a glimpse of the early universe, astronomers have observed a galaxy as it appeared just 800 million years after the Big ...

The most extreme black hole collision ever recorded looked, at first, like it should not have happened at all. Two objects each weighing roughly as much as one hundred Suns crashed together in a ...

Lurking further from its stars than Neptune is from the Sun, this is no inner planet, but it’s on a scale we recognize, ...

A new ultramassive black hole has been discovered, and we’re not even going to try to get our heads around its scale. The enormous object observed for the first time is 30 billion times bigger than ...

What happens when the United States tries to build a missile shield so ambitious that Russia and China start dreaming up weapons that no defense can stop?

In a discovery that's fit for a movie, Northwestern University astronomers have directly imaged a Tatooine-like exoplanet, orbiting two suns.While ...

A stronomers using the JWST have traced the source of a long-duration gamma-ray burst back to a supernova that exploded ...

Compelling evidence that the structure of matter surrounding supermassive black holes has changed over cosmic time has been ...

This is the strongest evidence yet of a rocky planet beyond our solar system with an atmosphere. Astronomers using the James ...

New research reveals that Earth’s solid inner core is actually in a superionic state, where carbon atoms flow freely through ...