Since its discovery in 1930, we've looked at Pluto as our solar system's ninth planet. But residing in the icy realm of the outer solar system, where the sun's brightness is less than 1/1000 of the brightness here on Earth, Pluto is nothing like the other planets of our solar system. It differs tremendously from the gas giants Jupiter, Saturn, Uranus, and Neptune, but does not resemble the rocky terrestrial worlds Mercury, Venus, Earth, and Mars.
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