Sample of the Morokweng Asteroid, 2006.
© Science Museum / Science & Society Picture Library
Sample of a large fragment of an asteroid that punched a 160km-wide hole in the Earth's surface in the Kalahari Desert, South Africa. In the past scientists believed that any meteorite like this one (more than 4 km accross) would have melted or vaporized upon impact leaving no remains. However in 2006 geologists drilled a 25cm fragment fossil meteorite out of South Africa's 145-million-year-old Morokweng crater.