| − | A curiosity of the planet is its magnetic field, which is about 1% that of Earth's. Scientists were perplexed to discover its existence, speculating that planet's outer core consisted of liquid iron. However, because it is relatively small and hot, such an outer core would long ago have expired. That Mercury is so intensely cratered would also suggest that Mercury should long ago have given up its magnetic field because of its extreme apparent age. Thus, according to current scientific understandings, the existence of Mercury's magnetic field presents a serious theoretical problem for uniformitarian models of the creation of the Solar System. | + | A curiosity of the planet is its magnetic field, which is about 1% that of Earth's. Scientists were perplexed to discover its existence, speculating that planet's outer core consisted of liquid iron. However, because it is relatively small and hot, such an outer core would long ago have expired. That Mercury is so intensely cratered would also suggest that Mercury should long ago have given up its magnetic field because of its extreme apparent age. |