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Astronomy

The Cause of Gamma-Ray Bursts in Distant Galaxies

Quick fact

Long-duration gamma-ray bursts are likely produced when a star over 20 times the Sun's mass collapses directly into a black hole, while short bursts come from merging neutron stars—some of which emit gravitational waves.

Why this is interesting

Imagine an explosion so bright it outshines an entire galaxy for a few seconds, and it happens a billion light-years away. What could possibly cause that?