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Planet Nine (and a reminder of what is and isn’t a planet)

Planet Nine (and a reminder of what is and isn’t a planet)

by Colin Stuart | Jan 21, 2016 | Astronomy news, solar system, Uncategorised

The internet and news media are awash with news of “Planet Nine”. For the last few years astronomers have known that some of the objects orbiting the Sun beyond Pluto appear to be mysteriously aligned. One possible explanation for this is that there is a...

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