[imglorp]

Travel, no. The universe feels designed to keep us apart.

But where are the signals-light/radio, or do we need new physics to see another communication medium?

Robotic prices or emissaries, maybe.

[AnimalMuppet]

Even light/radio has a signal-to-noise problem. You need a supernova-sized signal source, at least. (And then you have the problem of modulating a supernova...)