Comets Speculation and Discovery Author:Nigel Calder Entertaining, irreverent volume, first published in 1981 as the hoopla over the scheduled arrival of Halley’s comet heated up. An exhilarating illustrated journey through centuries of conjecture and discovery, the volume considers the nature of comets: their heads, tails and orbits; fantastic theories associated with the phenomena, the pos... more »sibility that a comet might have done in the dinosaurs, and much work. Lucid, sane and delightfully written.« less