"Echoed light" from a powerful supernova is just now reaching Earth. What's puzzling scientists is why people apparently didn't see the original explosion some 400 years ago.
Features on Mars that appear to have been carved by fluid were most likely created when recurring climate changes caused snow to fall and melt, a new study suggests.
China's carbon dioxide emissions are rising two to four times faster than previously predicted, threatening to scuttle the effects of the Kyoto Protocol, according to new research.
The recent slaying of three lions and up to four elephants in southern Kenya reflects the increasingly heated conflict between wildlife and the country's growing human population. Warning: graphic photo
New simulations run by researchers in Japan suggest that a planet-like body that might be even bigger than Earth could be discovered within the next five to ten years.
Electricity stimulates artificial "muscle" in new robotic fish. "When you excite them with electricity, they change size—they look alive," says one scientist.
An unusually high wave crashed onto a boulevard in northwestern Spain, pushing people and cars aside. Much of Western Europe saw harsh weather this week.
