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The biggest planet in our SOLAR system, is Jupiter. We have never explored outside of our own galaxy, so we do not know the size of other planets in space. I'm sure there are others though much much larger! Someday, we will get that far in space technology, but for now, all we know is what lies in our solar system. Outer galactic space travel is yet to come!

Well really now we have discovered a planet 1.7 times bigger then Jupiter whos name is tres 4

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13y ago

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