Two neutron stars orbit one another and spiral inward until they merge in this animation. The collision emits gravitational waves and a burst of light. Rumors suggest that LIGO may have detected waves from such a collision.
Read more: https://www.sciencenews.org/article/rumors-swirl-ligo-snagged-gravitational-waves-neutron-star-collision
Video: Goddard Space Flight Center/NASA
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Didn't this happen a few million years ago…