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And based on their calculations, or based on some calculations, the team believes that planet Y is likely a rocky world, much like Earth, with a mass somewhere between that of Mercury and that of our planet. And this is much smaller than the hypothetical masses of planet X, which is probably a gas giant up to about 10 times more massive than Earth. Research has also proposed that planet Y is somewhere between 100 and 200 times further from the Sun than Earth is. Stopping.