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7 asteroid impacts on Earth

By: Katherine Butler on Nov. 25, 2012, 12:07 p.m.
false color image of Spider Crater

Photo: NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team

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Spider Crater, Australia

The Spider Crater can be found in the Kimberly area of Western Australia. This false-color image was taken by NASA’s Advanced Spaceborne Thermal Emission and Reflection Radiometer, which is on the Terra satellite.

Shatter cones at the center of the crater give some indication of the Spider Crater's age, though experts are uncertain. (Shatter cones are cone-shaped rocks with a shattered appearance that indicate an asteroid strike.) NASA believes an asteroid may have hit this area between 900 and 600 million years ago during the Neoproterozoic Era, when "Earth underwent a series of global ice ages nicknamed 'Snowball Earth'," according to NASA.