If so, would inhabitants found on a new planet have the same flight in returning to their origin?
This raises a whole foreign concept of philosophy unrestricted by known earth accepted norms.
E.T. phoned home?
Why not? It is believed and debated by some scientists that this is already happening. Why do we put limits on ET's of how long they live, or how fast they can travel? If they exist, they do not have to live by our rules. Why would they limit themselves to one solar system? To answer your question one has to think outside the box.
The only reasons people travel is looking for a better place to live OR to find something they need. What do we have that aliens could possibly need? On the other hand, we have a decent place to live. A few asteroids diverted out beyond Jupiter and they could pretty much wipe us out and come down in a few years and simply take over.
we can't even get past the moon, so the odds of us reaching the next star system are remote at best.
the best argument *against* aliens visiting the earth, is the distances are simply too far for any sort of manned flights. You would need ships capable of supporting GENERATIONAL star travel........ meaning entire generations being born and dying ON the ship, as it covers the distance.
Unless of course, you really invent Warp speed and worm holes and all that.
If this is a major concern of yours, you have way too much free time.
highschool physics should tell you instellar space flight just doesn't work.
distances are just to far, with the closest star being over 8 light years away