Mulitverse

1 3/4 inch sphere, flameworked borosilicate glass

I have sometimes heard the concept of the multiverse described as similar to bubbles in a carbonated drink, the individual space time bubbles inflating into existence right next to each other but separate.

Scientists are now looking for evidence of this in the Cosmic Microwave Background.  Here is an ongoing study i found interesting: First observational test of multiverse.