A planet or A comet ????

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Caltech Profesor Mike brown, the discover of Eris, presented his calculation that said a drawf planet out of the neptune's orbit could be a brightest comet that ever seen. This calculation is presented during the annual meeting of the american astronomial society. For now, the object still called 2003 EL61. The 2003 EL61 has the similiar size as pluto, and rapidly spinning. And it's also finish it's one rotation every 4 hours