In the image above you can see two concentric circles. These mark the location of the Chicxulub crater, and the white line shows the coast of the Gulf of Mexico. See this Canadian site (scroll down to the third image) for a fuller explanation of how the image was made and for related images.
- The Chicxulub crater is a candidate for the asteroid impact that killed the dinosaurs, but not all scientists are convinced. Some believe the iridium layer (pictured at left) could also have been produced by volcanic eruptions at the same time as the layer was created.