Located 3,000 miles below the Earth's surface, the inner core is anchored by gravity within the molten liquid outer core. Until now the inner core was widely thought of as a solid sphere.

Beyond cooling, green walls also enhance urban biodiversity. The researchers found that plant-covered facades hosted over 100 ...

The rocket-powered Gracie will conduct five hops during its short lunar stay, including one into the depths of a shadowy ...

We celebrate 11 of the most beautiful mountains in the world: from the Alaskan wilds and remote Greenland to the giants of ...