  It is shown that space travel, even in the most distant future, will remain
confined to our own planetary system, and a similar conclusion will hold forth
for any other civilization, no matter how advanced it might be, unless those
extra-terrestrial species have life spans order of magnitude longer than ours.
Even in such a case it is unlikely that they will travel much farther than
their immediate stellar neighbourhood, as each such excursion will exhaust the
resources of their home planet so much that those will dwindle rather fast and
there might not be much left for the further scientific and technological
advancements. So the science-fiction fancy of a "Galactic Empire" may ever
remain in our fantasies only. And as for the mythical UFOs, whose quiet
appearances do get reported in the press once in a while, recent explorations
have shown no evidence that any such thing could have an origination within our
own solar system itself. And a "quiet trip" back and forth from a distant star
is almost impossible as the exhaust in any such trip will dazzle the sky like
another sun or perhaps more like a gamma ray burst occurring but not in a
distant part of the universe instead going off right in our own solar backyard.
