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First multimessenger observation of a neutron-star merger is Physics World 2017 Breakthrough of the Year - physicsworld.com:

First multimessenger observation of a neutron-star merger is Physics World 2017 Breakthrough of the Year - physicsworld.com: International collaboration of astronomers and astrophysicists that ushered in new era of astronomy tops our list of the 10 key breakthroughs in physics this year

Source: physicsworld.com

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