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re: NASA says there has to be a ninth planet that has 10 times the mass of Earth

Posted on 10/16/17 at 12:08 pm to
Posted by J Murdah
Member since Jun 2008
39820 posts
Posted on 10/16/17 at 12:08 pm to
It would probably take thousands of years to complete an orbit at that trajectory.

It's likely this planet did not form in our solar system, yet it was "caught" by our sun's gravity when it's parent system and ours passed close in the early days of galactic formation.
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