Groundbreaking image shows two black holes orbiting each other for first time

An artist's rendering of a black hole.

For the first time ever, astronomers have imaged two black holes orbiting each other, finally offering visual proof for the existence of black hole pairs.

Spotted through the faint fluctuations of radio light captured by telescopes both on the ground and in space, the two black holes are locked in a 12-year orbit some 5 billion light-years from Earth.