Tonight's finale: The pall of smoke clouds over Australia, as seen from orbit. A rare view of the bushfires' effect. (Photo by Chris Hadfield/Twitter)... more 
Tonight's finale: The pall of smoke clouds over Australia, as seen from orbit. A rare view of the bushfires' effect. (Photo by Chris Hadfield/Twitter) less 
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Mon, Jan 14, 2013 11:00 AM EST