UPDATE: This is a good article also - shorter from the Guardian (UK) and with a good diagram Astronomers investigating the odd alignment of rocks beyond Pluto have concluded that an undetected icy planet four times the size of Earth must exist
Remember, Pluto has been downgraded to a dwarf or minor planet status.
The planet that best fits the data would be on the order of 10 times as massive as Earth—putting it in the so-called “Super Earth” category, which includes many planets around other stars but none, until now, in our own solar system—and smaller than Neptune, the fourth-largest known planet orbiting the sun, which has about 17 Earth masses. Its most probable orbit is a highly elongated one that brings it to within 35 billion kilometers of the sun at the closest (“that’s where it does all the damage,” Brown says) and between three and six times as far away at its most distant.
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