![Abell-2151](https://www.astronomy.com/wp-content/uploads/sites/2/2023/02/Abell-2151.jpg)
The Hercules galaxy cluster (Abell 2151) epitomizes the universe today. Rich galaxy clusters like this congregate into even larger and more massive superclusters, which form the backbone of cosmic large-scale structure. CFHT/Jean-Charles Cuillandre/Coelum
Some cosmologists think the Big Bang was a single event in an infinite cycle.