| http://www.w3.org/ns/prov#value | - g on Pluto's sunlit pole and then refreezing on the other pole.The remarkable colour shift, which apparently took place between 2000 and 2002, confirms that Pluto is a dynamic world undergoing dramatic atmospheric changes and not simply a ball of ice and rock, according to scientists at the US space agency.They said they will compare Hubble pictures taken in 1994 with some from 2002 and 2003, as t
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