Add Yahoo as a preferred source to see more of our stories on Google. An AI simulation of an impact shows basalt-rich (purple) and basalt-poor (green) regions. (Curtin University) The planet Earth we ...

The planet Earth we live on today bears very few traces of its infancy. The 500 million years between Earth's formation around 4.5 billion years ago and 4 billion years ago – the Hadean eon – is ...