New evidence suggests that the world's largest known asteroid impact structure is said to be found in south-east Australia near Deniliquin, NSW! Evrim Yazgin, science writer for Cosmos magazine and Masters of Science (Physics) graduate from the University of Melbourne tells us about the Deniliquin structure (measuring about 520km across) which trumps the next largest crater by nearly double in size, currently found in South Africa. It is said to have hit earth about 400-500 million years ago during the Paleozoic era!

Evrim goes into the magnetic resonance technologies used to detect these craters (not just on earth but on the moon), what the characteristics of a crater are, and what would happen now if an asteroid hit earth (not good).