Once a scientist, then a priest Colby Cosh, National Post Published: Friday, December 22, 2006 Wednesday marked the 10th anniversary of the death of Carl Sagan, the American astrophysicist and novelist who became famous as the writer and presenter of the 1980 PBS series Cosmos. The decennial of his demise is being observed by scientists, humanists and writers everywhere, and the international newspapers and notable Web logs are full of personal testimony to his influence as a communicator....(snip)