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... s in the solar system, but something went wrong later.
One of the elements that define a celestial body as a planet is that the celestial body can clear other objects around its orbit. Pluto cannot do this, so it is downgraded to a dwarf planet.
This is the edge of the solar system, the farthest from the sun, and it receives very little light. For billions of years, it has been shrouded in extreme cold and boundless silence.
However, more than half a century ago, Pluto was o ...
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