Evidence of a massive asteroid strike about 300 million years ago has been found in South Australia.
Research by the Australian National University said the eastern Warburton Basin in the state's north-east had evidence thought to be caused by an asteroid measuring 10 to 20 kilometres in diameter.
The impact was studied by a visiting fellow at the ANU Planetary Science Institute and the ANU School of Archaeology and Anthropology, Andrew Glikson. ''The size of the shock metamorphic terrain, larger than 200 kilometres in diameter, makes it the third-largest discovered to date on Earth. . It is also possible the impact dates back to the late Devonian period - 360 million years ago - a time of major mass extinction.''
On Saturday, an asteroid will pass Earth, potentially interfering with communications. The closest it will get, about 27,700km, will be a record near approach for an object of its size, about 45 metres in diameter. AAP