WASHINGTON - MARCH 7: This NASA handout image is a high resolution topographic map of the Yucatan Peninsula created with data collected in the Shuttle Radar Topography Mission and released on March 7, 2003 in Washington, D.C. In the upper left portion of the peninsula, a faint arc of dark green is visible indicating the remnants of the Chicxulub impact crater. The crater was caused by a cataclysmic asteroid impact which, scientist theorize, may have caused the Cretatious-Tertiary Extinction of most life on Earth, including the dinosaurs, 65 million years ago. The Space Shuttle Endeavour flew the Shuttle Radar Topography Mission on Februay 11 to 22, 2000 and made detailed measurements of 80 percent of the Earth's landmass. (Photo by NASA/Getty Images)
