This shaded relief image of Mexico’s Yucatan Peninsula shows a subtle, but unmistakable, indication of the Chicxulub impact crater. Most scientists now agree that this impact was the cause of the Cretatious-Tertiary Extinction, the event 65 million years ago that marked the sudden extinction of the dinosaurs as well as the majority of life then on Earth. In this enhanced image the topography has been exaggerated to highlight a trough, the darker green line at the upper left corner. This trough is only about 10 to 15 feet deep and is so subtle that if you walked across it you probably would not notice it.
Space shuttle Discovery, returning to Earth Wednesday from its last mission, is expected to land in Florida just before noon Eastern Standard Time. Mission managers laud a nearly flawless flight.
Mexican tourists who still flock to Acapulco after foreigners have shunned the tourist destination due to drug-war violence may think twice after 15 decapitated bodies were found outside a shopping center Saturday.
Hurricane Richard did no major damage to Belize as it weakened into a tropical storm. It is moving into southeastern Mexico.
An endangered black male rhinoceros, with its horn partially cut off, stands in a cage after a radio transmitter was implanted in its horn before translocation at the Lake Nakuru National Park in Kenya's Rift Valley on Tuesday. After implanting radio transmitters into the horns to track the animals, and notching their ears, Kenya Wildlife Service is moving 10 black rhinos to the Tsavo National Park, southeast of Nairobi, to reestablish the population.
The toxic sludge now covering 15 square miles of Hungary and seeping into the Danube River is a serious environmental disaster whose severity and long-term consequences are still unclear. Will the release of the 35 million cubic feet of alumina refining waste become one of the Top 10 manmade environmental disasters of the past century?
Meteor Crater is one of the youngest and best-preserved impact craters on Earth. The crater formed roughly 50,000 years ago when a 30-meter-wide, iron-rich meteor weighing 100,000 tons struck the Arizona desert at an estimated 20 kilometers per second. The resulting explosion exceeded the combined force of today's nuclear arsenals and created a 1.1-kilometer-wide, 200-meter-deep crater. Meteor Crater is a simple crater since it has no central peak or rim terraces.
Hurricane Karl has ramped up to a Category 3 storm with winds of 120 m.p.h., and is bearing down on Vera Cruz, Mexico. Mexican authorities are evacuating oil platforms in the Gulf and residents are preparing for Hurricane Karl's arrival.
Hurricane Karl has a maximum sustained wind speed near 75 mph. The National Hurricane Center in Miami says additional strengthening is possible and Karl could approach major hurricane strength before reaching Mexico's coast.
Hurricane Julia became a Category 4 storm Wednesday. Tropical storm Karl is expected to reach hurricane status by the time it makes landfall in Mexico Saturday morning. Igor could brush Bermuda by Sunday.