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magnetar
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A recent study indicates that Betelgeuse has decreased in size by 15% since 1993.
http://esciencenews.com/articles/2009/06/09/red.giant.star.betelgeuse.mysteriously.shrinking
http://esciencenews.com/articles/2009/06/09/red.giant.star.betelgeuse.mysteriously.shrinking