Comment by alexose

Just spitballing, but maybe it would be possible with relatively modest advances in ion thrusters, and one (admittedly less-than-modest) breakthrough with fusion.

It's maybe too speculative to even matter, but I don't think it's _crazy_ to imagine a handful of AI-fueled advances in materials discovery during the next decade or two. Possibly enough to unlock laser fusion, or something that could be crammed onto a spacecraft.