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Q&A If planet 9 exists, is it correct to say that it is a "dark planet"?

If planet 9 exists, is it correct to say that it is a "dark planet"? By "dark" here I mean to a planet that doesn't reflect enough light to easily be seen from normal telescopes (in the current co...

2 answers  ·  posted 1y ago by deleted user  ·  last activity 1y ago by HDE 226868‭

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