Watched the first C4 5-part series Catastrophe earlier which is going through all the major catastrophes that have shaped the Earth (it's the Ice Age next week, folks). Very interesting and lots of CGI effects. This first one started with the planet Theia crashing into the Earth, causing debris and fragments to be blasted off the Earth's crust and which eventually formed into the Moon. (I remember telling Nick that once, to which I received one of those, 'She doesn't know what she's talking about!' looks. Ha, I knew I was right though! :biggrin What they mentioned in this programme tonight, but didn't go into, was that the Moon is every year moving three-point-something centimetres away from the Earth. What I wanted to know is what will the effects to Earth be when it does eventually move right out of our orbit entirely? Anyone know?