Tenth planet in solar system discovered

The simulated image shows a new planet discovered by US astronomers. The research group led by Mike Brown at the California Institute of Technology announced that they discovered the tenth planet in the solar system and named it "2003-UB313". The planet, a member of the Kuiper belt, a suburb region in solar system, is about 97 astronomical units from the sun. Its diameter is at least 1.5 times that of Pluto. (Xinhua/Reuters photo) By People's Daily Online