Astrophysics

Ultrahigh-energy cosmic rays twist and turn on their way to Earth, which has made it nearly impossible to identify the colossal monsters that create them.

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

Black holes seemed to come only in sizes small and XXL. A new search strategy has uncovered a black hole of “intermediate” mass, raising hopes of more to come.

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

One black hole is nice, but astrophysicists can do a lot more science with 50 of them.

A new study shows that extreme black holes could break the famous “no-hair” theorem, and in a way that we could detect.

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.

Three-dimensional supernova simulations have solved the mystery of why they explode at all.

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.