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The planet — the farthest-known object in the solar system — is currently 15 billion kilometres away from the sun, or about three times Pluto's current distance from the sun.
It has taken scientists this long to find the planet because its orbit is at an angle compared to the orbits of most planets. The new planet is rocky and icy, similar to Pluto, Brown said.
The briefing was hastily arranged after Mr. Brown received word a secure website containing the discovery was hacked and the hacker threatened to release the information.
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