The space between galaxies in a cluster is not entirely dark. Scattered across these vast regions is a faint, diffuse glow known as intracluster light (ICL).

It is well established that within the next 4.5 billion years, the Milky Way and Andromeda (M31) galaxies will collide.

In recent years, observations of our nearest galactic neighbour, Messier 31 (M31) or the Andromeda galaxy, have identified that the system has undergone a tumultuous history.