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Structure of a Logical Argument Whether we are consciously aware of it or not, our arguments all follow a certain basic structure.
In 1954, a young Princeton University doctoral candidate named Hugh Everett III came up with a radical idea: That there exist parallel universes, exactly like our universe. These universes are all related to ours; indeed, they branch off from ours, and our universe is branched off of others. Within these parallel universes, our wars have had different outcomes than the ones we know. Species that are extinct in our universe have evolved and adapted in others.
The next big thing? Comet ISON as observed by astronomer Edward Plumer when it was six hundred million kilometers from Earth. The top image shows the comet in the lower left; the bottom image is the same but with false color to bring out the faint tail. Image credit: Edward Plumer , used by permission. Now that comet Pan-STARRS has started to move on after a showy appearance in the twilight skies, it’s time to turn our attention to the next comet that could turn out to be a show-stopper: C/2012 S1 (ISON) , generally just called ISON. The comet was discovered in September 2012 by the Russian observatory called International Scientific Optical Network—ISON—using only a 40 centimeter (16”) telescope.