There's another reason it is likely
that aliens would avoid visiting earth. It is recognized in stories
like “War of the Worlds” that we have a serious microbial problem
here, one that an alien immune system might be ill-equipped to deal
with. Throughout human history there
have been massive plagues that have killed off large percentages of
the population, and even now we're struggling to contain certain
diseases that we've already discovered are creeping across our
borders (Ahem!) Even if an alien race had advanced medical
technology, they would have to adjust to and design antibodies
specific to our particular breed of microbes. Earth is not exactly
the vacation spot most aliens would choose, considering how our world
is so saturated with such an incredible variety of diseases. If
aliens even caught a glimpse of what the ebola virus can do, it's not
hard to imagine that they would be busy erecting defenses to make
sure we never visit them!
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