URL: https://www.thoughtco.com/thmb/XGK5z7om2RgCgrZeizPL-IPKwEU=/3952x3200/filters:fill(auto,1)/artwork-of-bubble-universes-117453174-f2d41bd7419544fe9342a7571ab07d8d.jpg
URL2: https://www.greelane.com/ja/科学技術数学/科学/multiverse-definition-and-theory-2699273/
