One thing I've always wondered is what fraction of c is actually realistically achievable with current technologies? (Maybe with scenarios for manned/unmanned spacecraft.)
Like are we at 0.1% or 0.01% or more orders of magnitude off?
Like are we at 0.1% or 0.01% or more orders of magnitude off?
The best speed for interstellar travel with technologies that current theory says should be within our reach can be achieved with a vehicle with a light sail pushed by a giant laser, that is powered by solar power. There is even a way to brake it when it reaches the target star. I forget what the predicted velocity was though.
This technology is basically the same as one that the Moties developed in the story, The Mote in God's Eye.
We do not yet have this technology. But we can show that it is plausible.
https://en.wikipedia.org/wiki/Project_Orion_(nuclear_propuls...