A comet's extremely close encounter with the Sun gives scientists a look at a region that has never been visited by spacecraft.

Nepal's years-old plan to spread out mountaineering activities across its Himalayas has had little effect, experts say.

Researchers find that some of the worst locations for accidents at sea are also some of the most environmentally sensitive areas.

A California nuclear power plant will close permanently amid doubts it can operate safely, 18 months after a small radiation leak was discovered.