A tiny opossum is revealing big potential for understanding human evolution, treating cancer, and learning how to repair damaged spinal cords.

Scientists announced plans today to put descriptions, pictures, audio, and video of all the world's 1.8 million known life-forms on the Internet for free.

Giant planets known as hot Jupiters are even hotter and wilder than scientists expected, according to new research that includes the first map ever made of a planet outside our solar system.

A violent explosion 240 million light-years away could be the first recorded example of the way huge stars died in the early universe, researchers suggest.

A hurricane even weaker than Katrina could devastate the Louisiana city, despite repairs by the U.S. Army Corps of Engineers, experts say.

Babies brawled at a Tokyo bawl-off, NASA spied Jupiter's other spot, and camels showed off their curves and long legs this week.

Radio waves bounced off Mercury like light off a "celestial disco ball" reveal fluctuations in the planet's spin that suggest it has a liquid center similar to Earth's.

The most massive extrasolar planet yet, a dense gas blob with a gravity 15 times stronger than Earth's, has been spotted, scientists say.

A mysterious formation recently mapped by the Mars rover Spirit was formed by a volcanic eruption that launched a rock "bomb," scientists say.

Detailed new scans show that the depth of the red planet's underground ice layer is extremely variable, coming within an inch of the surface in some places.

Scientists indeed cloned two gray wolves but kept sloppy records that led to published errors, say reviewers of a controversial scientific article.

Even as the last of its magnets is put into place, the Large Hadron Collider is facing the possibility of postponement due to a piece that broke with a bang in March.

High-tech analysis of the Christian manuscript shows even older commentary on Aristotle's theories of logic hidden under the religious writings.

An ancient life-form that has stumped scientists for more than a century was most likely a fungus that stood up to 24 feet (8 meters) tall.

The most Earthlike planet yet has the conditions to support life, including liquid water, say astronomers who found the planet orbiting a star 20.5 light-years away.