Are there UFOs in Cambridge?

[chaincey.ncfc]

Aliens have not visited earth in the past few thousand years but I am open to the thought that they may have visited millions of years ago,who is to say that they didnt,there certainly wouldnt be any evidence that they did and a planet full of swampland might not have been any interest to them,its quite possible that millions of years ago another civilisation may have been vastly superior to us now and for whatever reason never returned or even died out themselves,I mean who would have thought millions of years ago that dinosaurs would die out and some weird walking fish from the sea would be the dominant species