Scientists have long known that Earth and Mercury have metallic cores. Like Earth, Mercury's outer core is composed of liquid metal, but there have only been hints that Mercury's innermost core is ...

Scientists revealed Wednesday that Mars' innermost core appears to be a solid hunk of metal just like Earth's. The Chinese-led research team based their findings on seismic readings from NASA's ...

That solid iron inner core of Earth may still hold liquid iron, according to a new study from the University of Utah. Scientists have used seismic waves to research Earth’s inner core, uncovering a ...