* Astronomy

A new atlas shows Zimbabwe, Russia's Kola Peninsula and Quebec, Canada, as next-door neighbours - as they were 2.5 billion years ago. The map could reveal the location of valuable mineral deposits.

"We're completing the plate tectonic revolution" - Richard Ernst, a geology consultant in Toronto, Canada, who heads the mapping project.

That revolution started in the 1960s, when it was realised that the continents had broken apart from a 250-million-year-old supercontinent called Pangaea. But there has never been a definitive map of earlier supercontinents that existed more than 500 million years ago.

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