Newly released radar images gathered during a flight of the space shuttle Endeavour 3 years ago show what previous orbital photos haven't–the subtle topography related to the impact of an asteroid or comet that may have wiped out the dinosaurs 65 million years ago.
The original impact site lay beneath the waters of the ancient Caribbean. Sediments slowly filled in the 180-kilometer-wide crater, and subsequently, tectonic forces lifted part of the crater above sea level. Today, what's left of the Chicxulub crater, which is named for the fishing village near its center, straddles the northwest coast of Mexico's Yucatn peninsula.
Spaceborne instruments and earthbound