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Since 2006, Pluto is considered a “dwarf-planet”, which means it is not massive enough to be a planet, but also too massive to be a meteor. It is such a small planet that it shares a gravitational center with its biggest moon, Charon, which leaves this center actually in the space! To compare, we know that the center of gravity on Earth is at our planet’s core. But on Pluto, the center is not on Pluto at all, but somewhere in the sky.