If cars were as fuel efficient as supermassive black holes, researchers say, the vehicles could theoretically travel over a billion miles (1.6 billion kilometers) on a gallon of gasoline.
The April 21 earthquake was as strong as the 1906 San Francisco temblor but killed no one. Though fairly common, most big quakes occur out of harm's way, experts say.
Mars was once wet, many scientists say. Now it's dry. For the first time, a geological map of the entire planet is revealing the history of its dessication.
Earth Day meets the 21st century: Environmental and other scientists should embrace blogs as potentially potent tools for advancing science and policy, experts recommend.
Antiviral drugs can immobilize a virus, but mathematical models of viral pandemics show that if too many people pop the pills, the virus is likely to regain the upper hand.
Nearly a hundred years before San Francisco's great quake, three massive tremors rocked the central U.S. Experts say it could happen again soon—with even deadlier consequences.
Watch animation of NASA's proposed plan to crash a probe into the moon in search of lunar water, and hear a NASA scientist describe the probe's historic suicide mission.
NASA's first moon landing in more than 30 years will end with a bang, when a space probe launched in 2008 crashes into the moon's south pole to stir up signs of water ice.
