Fossil clusters are large groups of galaxies that feature

SMBHSs were not ‘discovered’ in the traditional sense of the word. Rather, over time, their existence became apparent. Also, over time, more and more massive ones were measured. There was a growing need for a name for the most massive ones, and that is where the term “ultra-massive black hole” came from. There was a revolution in physics in the late 19th/early 20th century when relativity replaced Newtonian physics and pushed our understanding of the universe to the next level. It became clear that space and time were intertwined rather than separate and that massive objects could curve spacetime. Fossil clusters are large groups of galaxies that feature very large galaxies at their centers, often LRGs. Fossil clusters and LRGs represent the final stage of evolution in galaxies where activity has slowed down. Few stars form in LRGs so they are “red and dead.” There is also little or no interaction between the galaxies.

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