It appears that I was naive to assume the Tunguska explosion of 1908 had been adequately explained. It was a meteorite or, more probably, a comet that exploded above a remote area of Siberia, wasn’t it? Not necessarily! This fascinating book shows that we still await a completely adequate scientific explanation and the jury is still out on what precisely the object was.
This is a nice little guide for the non-specialist collector of all things that go bump from above (and the effects they have on the rocks they impact).