Not only does Pluto have a heart, it has a beating heart. "Like a cosmic lava lamp, a large section of Pluto's icy surface is renewed by a process called convection that replaces older ices with fresher material." How can they not call that a planet? Pluto will always have a special place in my heart: the planet that went from a one pixel dot to a full-fledged world within my lifetime.
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