I've added two more of the wonderful Hubblecast videos from the European Space Agency to the Star Viewer map.
One of the videos is about Abel 2667. Abell 2667 is a cluster of galaxies, located about 2.7 billion light years from the Earth. The cluster is at least 350 times our Galaxy's mass. That much mass creates a lot of gravity, and that gravity is tearing the galaxy apart.
The other video looks at a ghostly ring of dark matter formed long ago during a colossal collision between two galaxy clusters.