The Cosmos

On June 15, 2016, scientists at LIGO announced they had detected a second pair of black holes merging, at a distance of 1.4 billion light years, releasing the energy equivalent of the mass of the Sun. The consequent ripples in space-time shook the twin detectors at LIGO on December 26, 2015.

This brings the number of confirmed detections by LIGO to two within just four months, giving scientists optimism that more events will follow, enabling quantitative predictions about how frequently these high-energy events occur across space and time.

Read more in this NYT article, including a short video.