Astronomy

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

There may be more than one way to tune a universe for life.

A supernova-like explosion dubbed the Camel appears to be the result of a newborn black hole eating a star from the inside out.

Could a comet, not an asteroid, have killed the dinosaurs?

Two esteemed astrophysicists peer into the future of space exploration.

Are space scientists too conservative and close-minded about the possibility that ET exists?

Small black holes were nowhere to be found, leading astronomers to wonder if they didn’t exist at all. Now a series of findings, including a “unicorn” black hole, has raised hopes of solving the decade-long mystery.

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.

Adventures in space travel remind us how imprecisely we measure reality.