Hello, I am an architect at UCL london and am currently looking at a hypothetical scene whereby the length of a day could be increased to something at least over a month (i.e. the earth would be spinning so slowly that it would be in contact with the sun for 30 days and darkness for 30 days). I am trying to see what it would be like to spatially and architecturally live in a nomadic fashion, whereby people would need to constantly follow the sun. I have also given myself a 250 million year deadline (by the way), when the tectonic plates collide to form Pangaea Ultima. In order for the moon to effect the spin of the earth in such a way, I realise that the mass of the moon would have to increase. What I would like to suggest is that over the course of 250 million years an asteroid could fall into earth's orbit and travel at such a slow speed that it would collide with the moon in pancake fashion, thereby increasing its mass to allow for the scenario to occur... [PLAIN]http://img546.imageshack.us/img546/6987/63graphichowasecondmoon.gif [Broken] My question is, is my scenario in any way plausible? Could this actually in a very rare circumstance occur?