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142 million years ago, an asteroid or comet slammed into what is now the Missionary Plains in Australia’s Northern Territory, forming a crater 24 kilometers in diameter and 5 kilometers deep. Today, like a bull’s eye, the circular ring of hills that defines Gosses Bluff stands as a stark reminder of the event. Landsat 7 acquired this image August 14th, 2002. [Source Images for earth energy mandalas and geographical information courtesy of U.S.Geological Survey National Center for EROS (Earth Resources Observation and Science) and NASA Landsat Project Science Office.]