Right now the closest star to us is Alpha Centauri, around 4.2 light years away. That would take faaaaaaar longer than the lifespan of a human. One could argue that FTL travel could solve it- but where would we develop that? As it stands right now, nothing travels faster than light. It is the galactic speed limit, and I personally don't believe humans will ever develop FTL travel. It needs infinite energy (something we don't have). If we can't develop FTL travel, we can't get anywhere other than interstellar space (ie not entering another solar system). Voyager 1 has still not reached interstellar space and it has been going for 35 years. Humans can get to interstellar space, yes, but we will never develop technology to get any farther than that. Humans will never visit any other solar system than our own. That is what I think.
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