Several mind-boggling conjectures about the existence of advanced alien civilizations have been made by astrophysicists who have found that for the last 7 billion years or so something is pushing the galaxies, adding energy to them. Something they are calling “dark energy,” a force that is real, but so far eludes detection. One of the most speculative ideas for the mechanism of an accelerating cosmic expansion is called “quintessence”, a relative of the Higgs field that permeates the cosmos.
In the art world, there’s a term called pentimento, meaning an alteration, an overlay on a painting, hiding evidence of traces of a previous work. In a similar vein, British physicist and former Stephen Hawking colleague, Sir Roger Penrose and his team, argue is that extinct universes exist that were filled with ghost black holes that are hidden, embedded in the Cosmic Microwave Background map.
“According to British physicist, Sir Roger Penrose’s conformal cyclic cosmology, the universe goes through an infinite series of “aeons,” each of which starts with a phase resembling a big bang, then forming galactic structures as usual, then cooling down as stars die. In the end the only thing that’s left are evaporating black holes and thinly dispersed radiation.”