August 2017

total solar eclipse

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. It is the first GW detection to be definitively correlated with any electromagnetic observation.

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partial lunar eclipse on August 7/8, 2017

GW170814 was a gravitational wave signal from two merging black holes, detected by the LIGO and Virgo observatories on 14 August 2017. On 27 September 2017, the LIGO and Virgo collaborations announced the observation of the signal, the fourth confirmed event after GW150914, GW151226 and GW170104. It was the first binary black hole merger detected by LIGO and Virgo together.

United Nations Security Council resolution