Two black holes

By Leah Crane

We normally see the effects of gravitational lensing when it bends lightSXS, the Simulating eXtreme Spacetimes (SXS) projectEarly in the morning on 28 August, the Laser Interferometer Gravitational Wave Observatory (LIGO) felt two ripples in spacetime wash over it. But due to a strange effect of general relativity, the two signals may actually be from the same event. Gravitational waves, which stretch and contract spacetime itself, emanate from massive objects moving around and colliding with each other. LIGO detected its first gravitational wave from a pair of black holes merging in 2015, and since then has observed more …

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