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Our Solar System Just Got Way More Interesting

Neptune is the last stop when it comes to premier real estate in our Solar System. It's nearly 4.5 billion kilometers away and it takes 165 earth years for it to orbit the sun. Beyond it, things are, as astronomers now say, 'Trans-Neptunian.' Out in the nether reaches of the solar system, astronomers are finding trans-Neptunian objects (TNO's) fairly routinely and some of them are decidedly odd. There's the still-hypothetical "planet nine," which is much...

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