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Tags: Abu Ma’shar, Andreas Celichius, Churyumov–Gerasimenko, Comet Donati, Comet Encke, Comet of 1577, Cometomantia, Dirty Snowball, Electric Comet Theory, Flying sandbank, Fred Whipple, Galileo, Halley's Comet, History of comets, Leuschner, Opik, Raymond Lyttleton, Robert Aitken, Rosetta, The Oort Cloud, Tycho Brahe, William Campbell
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