For humans to ever venture out among the stars, we will have to solve some hefty logistical problems.
Not the least of these is the travel time involved. Space is so large, and human technology so limited, that the time it would take to travel to another star presents a significant barrier.
The Voyager 1 probe, for instance, would take 73,000 years to reach Proxima Centauri, the nearest star to the Sun, at its current speed.
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