A wormhole also called Einstein-Rosen bridge is a passage, a “hypothetical topological feature that would fundamentally be a shortcut connecting two separate points in spacetime. A wormhole, in theory, might be able to connect extremely far distances such as a billion light years or more, short distances such as a few feet, different universes, and different points in time. A wormhole is much like a tunnel with two ends, each at separate points in spacetime” (Wikipedia).
But, as the guys at space dot com warns us: “be wary: wormholes bring with them the dangers of sudden collapse, high radiation and dangerous contact with exotic matter.”
from my short story “As I Walked Down the Aisle”
Redd, Nora Taylor. "What is a Wormhole." Space.com, 13 Apr 2015, www.space.com/20881-wormholes.html.
"Wormhole." Wikipedia: The Free Encyclopedia, Wikimedia Foundation, Inc., last edited 3 March 2017, en.m.wikipedia.org/wiki/Wormhole.