While I support the statistical argument due the vastness of the Universe that there's more than enough room for even HUNDREDS of BILLIONS of
intelligent alien civilizations, I've yet to see any evidence confirming such, nor any evidence that any might be visiting our tiny little speck of
If there's just one intelligent technological species per galaxy, that would equate to hundreds of billions of civilizations. Still, that's per
galaxy, and the galaxies are vast not to mention the spaces between them and the universe itself.
If you could travel instantaneously anywhere, and spent just one single second at every star in just our galaxy, it'd take you over 12,000 YEARS to
survey just our galaxy.
The rest of the Universe? It'd take longer than the Universe has even been in existence hundreds of billions of times over, and that's just one
second per star at instantaneous travel.
Good luck on finding anyone or anything else in the lonely dark, especially since there's also that whole bothersome matter of Time and Timing. You
may visit a spot once inhabited, but so long ago any sign is so far gone as to be unrecognizable. You may visit a spot that will have life, one day,
but, millions of years hence.
To effectively survey the universe for life, one would need not only a time machine, but, would also need be effectively immortal to have time enough
to actually effect an effective survey.
You'd have to be able to take snapshots of the entirety of the Universe in evolutionary feasible chunks of progression.
Snapshot our own planet only 1000 years ago and you'd find zero sign of 'intelligent' life detectable from space.
For now, however, invisible undetectable aliens anywhere in the universe, whether on the other side of it or right next door, they're worthless.
Invisible undetectable aliens are worthless until such time as we can observe them.
edit on 20-3-2013 by Druscilla because: (no reason given)