Groundbreaking image shows two black holes orbiting each other for first time Observations by a system of radio telescopes have offered the first visual evidence for the existence of black hole pairs. But vital follow-up observations are needed before we know for sure.

A cosmic fountain 18 billion times greater than our sun. #Supermassivemonster #Blazar

"two black holes are locked in a 12-year orbit some 5 billion light-years from Earth... Observations of OJ287 go back before astronomers even knew black holes existed..."
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