Scientists say they’ve confirmed Earth’s inner core has been slowing down. Here’s what it could mean — and why the topic has been the subject of fierce debate.

The surface of Earth's inner core may be shape-shifting, new research suggests. The study, published Feb. 10 in the journal Nature, looked at earthquake waves that have skimmed the edge of the ...

Now, the inner core is rotating more slowly than before the shift. There's no risk of a cataclysmic disaster of dead birds falling from the sky or skin-blistering sunburns in seconds, like in the ...

The inner core was discovered in 1936, and its size (about 20% of Earth's radius) is one of the best-constrained properties of the deep Earth.

New research may have finally figured out what is inside the Moon, and it has scientists excited to dig deeper.

Well, the verdict is in. The Moon is not made of green cheese after all.

A ghostly white river is coursing over the continent this month. It isn’t fog, and it isn’t cloud. It’s the packed heart of ...

The core of the Red Planet may be filled with sulfur. New experiments have shown that the core of Mars formed much faster ...

Scientists say they’ve confirmed Earth’s inner core has been slowing down. Here’s what it could mean — and why the topic has been the subject of fierce debate.