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Planet Nine

space Maturity 11-13 Next article →

Some people think a big world is out there. It stays far away in the dark. We cannot see it yet. It might be a very large world. It would be far past the other worlds. Some think it is out there because of how other things move. This big world could be pulling on them. We do not know for sure if it is real. It is a big mystery. Do you think it is there?

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