the next problem... not a real obstacle... for now, we need rover probes sent to available (in this solar system) orbs, planets and moons... that develop the technology for real time signaling, command and control, and data flow... so we can operate robotic equipment remotely and instantly...
What we learn about where we are, will tell us much about where we are going and how to get there.
a half light speed probe, sent to the closest star and navigable in real time by local controls, could get us collecting ‘right now’ data from another system, within 8 years or so... which is within our lifetime.
and what we learn en route might out pace what we sent originally, so that when the probe arrives in a proximal system... we already have found a way to get matter from point a to b, in ways not yet developed by man.
However I believe that the military would lock it away and instead use it to do NO TIME DELAY drone controls and real time solar system warfare by robotics... all around the earth and within the solar system long before then.
My guess is that DARPA has multiple advanced white papers in process and archived already.
“...develop the technology for real time signaling, command and control, and data flow... so we can operate robotic equipment remotely and instantly...”
I have no doubt that, in time, humans will perfect this technology for that exact purpose.
I believe it’s also why SETI has never detected signals from extraterrestrials. ET doesn’t use radio to communicate.