Thread:Nra 'Vadumee/@comment-4844180-20120814184218/@comment-1743498-20120814200957

The extreme environment shifts could work if it followed a predictable pattern. For example, the creatures of Earth that lived in the temperate zones had to adapt the seasonal changes. More extreme, the planet Mossoon has "death" seasons where every 20 years, it gets close enough to its star to kill any unshielded life forms.