Well, I’m not so sure. I noticed a couple of nights ago that Venus has become an evening star again, and she set me on course for a theory:
What I think is that all the planets in our solar system are teeming with intelligent, sophisticated life, and that they’ve all been here and taken a look at how earthlings conduct their affairs. They were so appalled that they constructed a cloaking device which makes their planets appear uninhabitable so we won’t go there. To them, planet earth is like one of those particularly nasty neighbourhoods we have down here – bad enough even for the people who are used to living there, and certainly not the sort of place you’d ever want to make subject to an exchange arrangement. And I expect they noticed that humans and chimpanzees are very closely related.