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Roter Kamm impact crater This radar image shows the Roter Kamm impact crater in southwest Namibia. The 2.5 kilometer-wide (1.6 mile) crater formed when an impactor about the size of an SUV hit the Earth around 5 million years ago. The colors in the image come from different bands of radar used to peer beneath a thick covering of sand to see layers of rock that were ejected during the impact. The image was captured by a radar instrument on the space shuttle Endeavour in 1994. NASA