When Earth first formed around 4.5 billion years ago, it was a ball of molten rock. Over time, heavier elements, like iron and nickel, sank to the planet's center, forming the Earth's early core.

No one knows why the river of liquid iron flowing 1,400 miles beneath our feet just reversed course.

A river of molten iron, more than 2,000 kilometers below the surface, appears to have pulled off something Earth scientists ...

Beneath roughly 5,150 kilometers of rock, liquid metal, and extreme pressure, Earth’s solid inner core sits at temperatures ...

Scientists are working to solve a mystery of Earth’s molten outer core, which lies more than 2,000 kilometers beneath our feet ...

New research suggests that Earth’s solid inner core might not be as rigid as once believed. Instead, it could exist in an unusual “buttery” state of matter, one that challenges long-standing ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

Scientists have uncovered new information about the Earth's core: it may not be completely solid. Instead, its center may be more malleable than expected and has changed shape in recent years. These ...

Earth's magnetic field is generated in the outer core, 2,900 kilometers (1,800 miles) below sea level. (ESA/AOES Medialab) Something strange is going on, deep below the ground beneath our feet. In the ...

Add Popular Science (opens in a new tab) More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results.