Record-breaking gravitational wave puts Einstein's relativity to its toughest test yet — and proves him right again

An animation of two black holes merging into one. In a new study, scientists used the clearest gravitational-wave signal ever detected to "listen" to a distant black hole merger and put Einstein's gravity to its toughest test yet. A record-breaking gravitational wave signal let scientists "listen" to a distant black hole merger and put Einstein's gravity to its toughest test yet.

A record-breaking gravitational wave signal let scientists "listen" to a distant black hole merger and put Einstein's gravity to its toughest test yet.