Telescopes orbiting Earth can peer billions of light-years into space to observe incredible phenomena across the cosmos. 9 min read Telescopes orbiting Earth can peer billions of light-years into ...

Mountains. Rainforests. The ocean. These critical Earth systems provide some of the most basic needs for life on Earth: water, oxygen, a stable climate. But these systems are increasingly at risk ...

This story appears in the August 2010 issue of National Geographic magazine. We sink into Stargate, sweeping the void with our dive lights. Fifty feet from the surface looms a pale haze, less ...

Captive wild animal encounters are hugely popular, thanks partly to social media. But our investigation shows many creatures lead dismal lives. For $10, tourists can pose with this tiger at Phuket ...