Loading…
Loading content
Loading…
Loading contentThe hypothesis that our observable Universe is one of many, or of infinitely many, universes.
Several ideas — eternal inflation, the string-theory landscape, and interpretations of quantum mechanics — suggest our Universe may be one region among a vast ensemble with different properties. It is sometimes invoked to explain why physical constants appear fine-tuned for structure.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.