If the known physical laws are not violated, humanity will forever
remains in the Solar system. But in the Solar system, apparently, there is
nothing principally new and interesting for fundamental science. Perhaps there
is only some primitive form of life in atmospheres of the gas giants.
However, to move freely even in the Solar system, we need a velocity at least of
about 1000 km/sec. Annihilation of matter and antimatter only is the known
source of energy for that a spacecraft of mass of a few hundred tons could
reach this velocity. And one needs tens of kilograms of antimatter. This is
unlikely to ever become a reality.
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