In theory, the Milky Way could be a ‘galactic transport system’.
Work by Peter Kuhfittig and colleagues suggests that the “dark mass” of our Galaxy and the super-mass in the Core could be wormholes.
Preprint here:
Possible existence of wormholes in the central regions of halos
Kuhfittig has discussed wormholes in the Halo in a series of wormhole papers: arXiv search
Gravitational lensing of wormholes in the galactic halo region