[MaxMax]

I believe that Gravity is the key to space travel. It's instant and cannot be measured.
Imagine traveling in an instant to another galaxy. Our squishy bodies will be
limited though, to a build up of speed making long travel that much more frustrating.

I wonder how long it takes to build up to instant speed. /ponder

Gravity communication would allow messages between galaxies millions of light years apart.

Gravity is the answer.

[Telepathic Intruder]

That’s actually something I’ve thought about. What would be the perfect form of propulsion? Gravity waves. It is in fact a form of energy, just as capable of producing an opposed reaction. But how to create it? Unknown for the present time, of course. And the nice thing is that like neutrinos, it passes through solid matter leaving no harmful consequences.

[GunRunner]

Gravity travels at the speed of light.