Astronomy

Brown dwarfs such as “The Accident” are illuminating the murky borderlands that separate planets from stars.

Jupiter and Saturn should be freezing cold. Instead, they’re hot. Researchers now know why.

Groundbreaking results show that neutron stars of different masses may have the same size — upending astrophysical models.

A new proposal would use quantum hard drives to combine the light of multiple telescopes, letting astronomers create incredibly high-resolution optical images.

Radio waves, longer and less energetic than visible light, give astronomers access to some of the most obscure physics in the cosmos.

For decades, astronomers debated whether a particular smudge was close-by and small, or distant and huge. A new X-ray map supports the massive option.

We don’t know why the universe appears to be expanding faster than it should. New ultra-precise distance measurements have only intensified the problem.

Over the past two years, astronomers have rewritten the story of our galaxy.

Once missing in action, middleweight black holes have finally been detected. Now researchers are trying to figure out how they grow from small ones.