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Not sure mate, but a comet the size of jupiter sounds pretty far fetched. I think if NASA imaged a comet of that size it would be instant news world-wide. Also, if this comet (Planet X, Nibiru?) periodically enters our solar system (every few thousand years the believers say) and has been doing so for 4.5 billion years, we wouldn't be here. The gravitational mass of an object that size would have ruined the orbits of earth and other planets long ago. Might have ejected the inner planets completely.
I don't think such an idea can be ruled out yet, but this object would have to be orbiting a long way from our solar system.
There is a thread here somewhere, just go to search and type Nibiru, people who know more about this than i do have posted their thoughts there.
cheers
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