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Up until now it has been established that there are eight known planets in our solar system. But scientists in the US say they have evidence that there is another planet. They've called it Planet Nine and they believe it's ten times bigger than Earth. Dr Seth Shostak is a senior astronomer at the SETI Institute in California whose declared mission is to seeks evidence of life in the universe. Dr Shostak has been sharing his initial reaction on Newsday (Caption: An artist"s rendering shows the distant view from "Planet Nine" back towards the sun. Credit: Reuters/R. Hurt/Caltech/IPAC/)