Astronomers have identified a wildly distorted world that looks less like a sphere and more like a squeezed citrus fruit, and ...

The Earth’s inner core, predominantly composed of iron with a minor admixture of nickel and light elements, is a critical component in understanding our planet’s magnetic field and thermal evolution.

A European-Japanese space mission will reach Mercury in 2026, carrying instruments designed to answer a question that has ...

A new study disputes the prevailing hypothesis on why Mercury has a big core relative to its mantle (the layer between a planet’s core and crust). For decades, scientists argued that hit-and-run ...

The early years of our solar system were a period of unimaginable chaos and violence, a gravitational free-for-all where colliding planetary embryos competed for survival. In this tumultuous ...

CAPE CANAVERAL, Fla. (AP) — 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 ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

Scientists have discovered that Earth’s inner core may not be fully solid. A rare “superionic” state of matter could explain ...

A surprising analysis of the composition of gas giant exoplanets and their host stars shows that there isn’t a strong correlation between their compositions when it comes to elements heavier than ...

Astronomers say they have spotted, for the first time, what appears to be the exposed core of a gas giant planet that has shed -- or never found -- its gaseous atmosphere. A team lead by the ...