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Originally Posted by simon
It's unlikely that there's anything else much bigger than Xena in the Kuiper Belt - Mike Brown's surveyed most of the sky now and anything bigger would have to be in an even more inclined orbit than Xena.
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Which still IS possible. What if there are a whole bunch of planetoid objects the size of Mercury or above under all kinds of weird orbital angles. Will that all for a yet another redefinition of the solar system as we know it? I just want something more permanent, if we're already redefining things.
There's also a question of other large onjects that might be found BEYOND the Kuiper Belt. Surely the gravitational pull of the sun extends far beyond what we know now as our solar system.