Is the multiverse actually real? A physicist explains why it’s more concept than reality

Whether you need a new villain or an old Spider-Man, your sci-fi movie will sound more scientifically respectable if you use the word multiverse. The Marvel multiverse puts different versions of our universe “out there”, somewhere. In these films, with the right blend of technology, magic, and imagination, travel between these universes is possible. For example (spoilers!), in Spider-Man: No Way Home, we discover there are other universes and other Earths, some of which have their o