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quote:A pair of strange new worlds that blur the boundaries between planets and stars have been discovered beyond our Solar System. A few dozen such objects have been identified in recent years but this is the first set of "twins". Dubbed "planemos", they circle each other rather than orbiting a star. Their existence challenges current theories about the formation of planets and stars, astronomers report in the journal Science. "This is a truly remarkable pair of twins - each having only about 1% the mass of our Sun," said Ray Jayawardhana of the University of Toronto, co-author of the Science paper. "Its mere existence is a surprise, and its origin and fate a bit of a mystery." 'Double planet' The pair belongs to what some astronomers believe is a new class of planet-like objects floating through space; so-called planetary mass objects, or "planemos", which are not bound to stars.