Incidentally, I have it on good authority that the Earth is really the only place to be. I cite Dr Zachary Smith, he of the Lost in Space saga who found that there was simply no substitute for the original, and this, having reluctantly traveled to many dismal planets. In fact, Dr Smith was willing to do almost anything, commit any treachery, just to get back to the Earth. That was not to be. The good Doctor was far too avaricious to get the ride home. And he didn't much like aliens, to boot!