The last astronomy event of several messengers would have gravitational waves, particles and light that arrives at the same time. Does that have happened?
It is difficult to believe, but here in 2025, we are less than a complete decade in the era of gravitational wave astronomy. It was only in September 2015 that I advance Ligo, the first gravitational wave observatory of humanity capable of detecting the realistic gravitational waves produced in the universe, entered online. In a matter of days, the first astrophysical signal, with two black fused holes, was detected. In later decades, we have now seen hundreds of gravitational wave events: events that mean the fusion of mass and compact objects such as black holes and neutron stars. Ligo has also joined by additional gravitational wave detectors, including the Virgo detector in Europe and the Kagra detector in Japan. Combined, they allow us not only to detect gravitational waves, but also to locate them in the sky.
Gravitational wave eventIn 2017, it even arrived along with an electromagnetic counterpart: an explosion of gamma rays that was detected only 1.7 seconds after the gravitational wave signal ceased. This turned out to be a kilonova, or the fusion of two neutron stars, in a nearby galaxy …
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