M51 Whirlpool galaxy and NGC 5195.

When galaxies collide it's the smaller of the two that ends up being impacted the most. Here the major galaxy M51 (NGC 5194) is tearing chunks out of its dwarf neighbour NGC5195, however, not without being re-shaped itself. Gravitational forces from the encounter have resulted in the tightly wound spiral arms that give it the appearance of the name it has been assigned.
Great detail from this telescope on this bright object and I don't regret starting over again on some steps of processing to make the best use of the data. Used an image from Hubble to keep the details as accurate as possible when deconvolving. This is one of my favourite galaxies.