What have we here? The universe in a glass ball, resting on a table. I got the idea from the novel of the same name by Gregory Benford. It tells the story of some scientists who inadvertently create a wormhole in a laboratory....

This is a conceptual representation of the baby universes idea: where our Universe is linked to an infinite number of others via bridges called wormholes, and each of these other universes is itself linked to others....

This is a conceptual representation of the eternal inflation theory – infinite bubble universes emerging constantly in inflationary space. Each separate universe will have its own physical laws, which may not be anything like those in our universe,...