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ScienceDaily (Feb. 27, 2008) — A mega-collision between two large embryonic planets could have created Venus as we know it, according to a new paper by a Cardiff University scientist.

Venus is nearly the same size and density asd the earth, yet it has a surface temperature of 720 K, an atmosphere mostly made of carbon dioxide and no evidence of oceans or landforms. It has been described as “Earth’s evil twin”.

Dr Huw Davies, of the School of Earth and Ocean Sciences argues that a mega-collision could explain these differences. In particular the collision could explain why the interior of Venus is dry, the odd rotation of the planet and the carbon dioxide atmosphere.