Nilgiri
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If you referring to interstellar travel!? We have a long long way to go!! Most practical option right now is solar sail...it is theorized that it can hit speeds close to 80% speed of light!!!
Most craziest idea is alcuberrie drive!!! Negative energy is produced in laboratory conditions but in very minute conditions!!
Or we better find that wormhole!!
a) Nah I was just referring first to information travel. We may hack into highways regarding that before we figure out how to do that for matter.
Problem with the solar sail (and ion drives for that matter) is the time it takes to develop such a velocity. You would have to be prepared for whole generations for a mission....on a hunch. Again it lies far in the future if we havent figured anything else out by then.
Most craziest idea is alcuberrie drive!!! Negative energy is produced in laboratory conditions but in very minute conditions!!
I've heard of it. In fact my close friends PhD unlocked (conceptually) something very related regarding negative pressure and negative absolute temperatures and energies too as a result (using just plain statistical thermodynamics).
We may indeed be able to harness dark energy in some way once we get some understanding of it.
Or we better find that wormhole!!
Yes or hyperspace or other sorts of interdimensional travel. The theories and concepts are numerous. Practical developments will take a long time.