What happened here?

Vikas Chander, taken from Obstech, Chile

The giant elliptical galaxy Fornax A (NGC 1316) lies 60 million light-years away, accompanied by the smaller spiral NGC 1317. Although the pair appear to be interacting, Fornax A’s distorted nature is likely due to previous encounters, including the merger of gas-rich galaxies that produced it. This LRGB image was taken over 22 hours on a 17-inch scope.