This paper lends absolutely no credence to the various crackpots and deluded people who claim they have met aliens.
And the reasons why that is essentially impossible all stem very clearly from much more solid physical considerations, that have to do with the extreme amounts of energy necessary for interstellar travel at anything approaching a reasonable time frame (i.e. less then the age of most stars).
And the reasons why that is essentially impossible all stem very clearly from much more solid physical considerations, that have to do with the extreme amounts of energy necessary for interstellar travel at anything approaching a reasonable time frame (i.e. less then the age of most stars).