The Antennae Galaxies are a spectacular example of a cosmic collision. These two galaxies are undergoing a merge process, which will probably result in a huge elliptical galaxy in the future.
This is a challenging object. In one hand, there are some interesting details in the galaxies to show, as a number of active areas. On the other hand, the long stars and dust tails are very dim, and need a good signal ratio and a careful processing.
In the inverted version of the image, these “antenas” can be better seen: