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The Final Frontier: 20 Eerie and Unusual Space Facts - Part 2 - Fact Republic | Space facts, Cool science facts, Astronomy facts
an image of the planets and their names
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20 Eerie and Unusual Space Facts - Part 2

01. In 2015, scientists detected, for the first time, the merger of 2 black holes in a galaxy 17 billion lightyears away by measuring the gravitational waves emitted by the collision. As they spun around each other violently, they released more energy in the form of gravitational waves than the combined light from all the stars in the Milky Way in 4400 years.
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