Hubble Space Telescope image of galaxy NGC 4993 showing the fading optical counterpart (reddish dot, upper left of center) to the gravitational wave event GW170817. This event, likely a kilonova resulting from a neutron star merger, was the first detection of both gravitational waves and electromagnetic waves from the same event, providing crucial insights into the universe's formation of heavy elements and distance scales.

Astronomy Picture from 23/10/2017

NGC 4993: The Galactic Home of an Historic Explosion

Source: https://apod.nasa.gov/apod/ap171023.html


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