It is a mystery which is truly beyond even Sherlockian scale - a cosmic explosion which left no trace behind except deep within the bark of two cedar trees. Fusa Miyake, of the Nagoya University in Japan, studied the growth rings of two trees dating back 1,200 years - and discovered that an explosion of epic proportions occurred between 774 and 775AD. But there is no record of something happening in our skies in that period - except perhaps for one tiny, obscure account by a 13th-century historian. The problem - and this is where we need to call in Mr Holmes of Baker Street - is that there should be a record. If this was a supernova - a star exploding deep in space - we should either be able to spot the remains with modern telescopes, or find visual accounts in the written accounts of Chinese and European historians
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