The Antennae in Corvus. A pair of interacting galaxies with spectacular tidal tails and severe central disruption triggering massive star formation.
L 10hrs, RGB 3 hrs each, all in 1hr unbinned subs. Field 36 min arc. Aspen CG16M on 20" PlaneWave. This galaxy is almost implausibly colourful. We have actually desaturated this image a bit.