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LIGO Scientific Collaboration/RIT

Comparing the GW170104 signal seen by LIGO (in blue and orange) with an RIT computer simulation of a black hole merger (in black). The black circles each represent one of the simulated black holes. Their sizes are in proportion to the black hole masses, with one being twice as massive as the other. The larger black hole was made to spin on an axis, shown by the gray arrow, which points in the direction of the black hole’s ‘north pole.’

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