From Nibiru to Tiamat, an astronomic scenario for earliest Sumerian cosmology

The paper has been motivated by the recent discovery that Jupiter core mass is less than Saturn, the natural explanation, studied in Chiana, being the impact with a large planet, mass estimated at 10 times Earth's. We discuss the hypotheses that the impact occurred about 7000 BC by a body that had recently entered the inner solar system. We show several astronomic consequences and how Sumerian and Greek myths can be explained in such a context.