The multiverse—the idea that infinite universes stretch beyond our own—has gained traction among physicists.
Alternate realities, parallel dimensions, and multiple universes, whatever you call it, is a popular trope in science fiction.
In recent years, such ideas have shifted from fantasy and speculation toward science.
Theoretically, infinite universes might stretch beyond our own, like endless bubbles in a sea of boiling water.
In some other universe, you’re not reading this sentence but skydiving. In another, you’re nothing but a cockroach. In yet another, not only is life impossible, but atoms don’t even exist.
Author summary: Physicists consider multiverse theory.