GW170817

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What Wikipedia says

GW170817 was a gravitational wave (GW) observed by the LIGO and Virgo detectors on 17 August 2017, originating within the shell elliptical galaxy NGC 4993, about 140 million light years away. The wave was produced by the last moments of the inspiral of a binary pair of neutron stars, ending with their merger.

Excerpt from the Wikipedia article “GW170817”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: LIGO Scientific Collaboration and Virgo Collaboration, CC BY-SA 4.0, via Wikimedia Commons.