The planets, for instance, revolve in the same direction and in almost the same plane. The four inner ones (Mercury, Venus, Earth, Mars) are smaller and denser than the outer ones (Jupiter, Saturn ...

Earth's inner core rotates in the same direction as the surface of the planet but rotates ever so slightly faster, completing one extra rotation every 1,000 years or so. Outer core ...

Deep beneath the Earth's surface, the inner core has long been thought of as a solid sphere, steadily growing as the outer core cools and crystallizes. However, a new study suggests that the inner ...

Patterns are starting to emerge in these exoplanetary systems, and in new research, a team of scientists says it's time to start classifying exoplanet systems rather than just individual planets.

The gravitational games of the outer planets removed many of those protoplanets from the inner solar system, but plenty were left behind. And then came the collisions.

Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown ...

Below the mantle is the Earth's core, which has an inner and outer section. ... At the center of our planet lies the dense inner core, which is around 750 miles thick and thought to be solid.

For years, scientists have puzzled over why Earth and Mars are missing certain key elements. Now, a fresh study suggests ...

The rotation of Earth’s inner core may have paused and it could even go into reverse, new research suggests.. The Earth is formed of the crust, the mantle and the inner and outer cores. The ...

Deciding on a rule to designate inner and outer regions wasn’t easy, but the team classified outer planets as those that take longer than 130 days to orbit their stars and are separated by ...