There is no question that mankind will never be able to fully explore the universe. The Proxima Centauri star, which is the closest one to Earth, is over four years away. For a human to reach there, it would take tens of thousands of years even with the finest propulsion technology currently in use.

However, it might be possible to shorten the distance traveled. There are numerous methods for doing that, ranging from nuclear propulsion to laseraccelerated solar sails. But even with the help of these technologies, a human lifetime would not be very successful. Only those who can travel at the speed of light or faster can actually access the galaxy.

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