Galactic Wormhole!
The entire galaxy might be a giant wormhole. And it may be navigable. Some really smart dudes and chicks, called "scientists", took a map of the dark matter in the Milky Way, threw in two scoops of quantum mechanics, stirred in a little math and voila! "...what we get is that our galaxy could really contain one of these tunnels, and that...tunnel could even be the size of the galaxy itself....We could even travel through this tunnel, since, based on our calculations, it could be navigable."
Check out the full story at Science Daily...
http://www.sciencedaily.com/releases/2015/01/150121083648.htm