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Both the black holes are estimated to be a staggering three-and-a-half-billion light years away from our solar system.

In an effect that the researchers compared to the Doppler effect, when the brighter black hole orbits closer to us, we get more of its light, as it moves further it dims. Sure enough, when Haiman and his colleagues examined images of PG 1302-102 collected by NASA’s Hubble...