gamma-ray-bursts

Gamma-ray bursts are flashes of gamma rays from collapsing massive stars and merging neutron stars. Learn how they work, how astronomers catch them, and why the brightest one on record, GRB 221009A, still puzzles researchers.

Wolf-Rayet stars are massive, extremely hot stars that have blown away their outer layers in winds of thousands of kilometers per second. They show us the inside of a star, they seed space with dust and heavy elements, and many will end as supernovae or black holes.