An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Continent-size islands deep inside Earth's mantle could be more than a billion years old, a new study finds.

Enaiposha, also known as GJ 1214 b, is an exoplanet orbiting the red dwarf Orkaria, located just 48 light-years from the ...

Mars’ small size severely limited both the longevity ... The inner solar system contains four vastly different planets, and we still don’t really understand why, said Clement.

Just six light-years from the solar system — in cosmic terms, our backyard — exists a world about half the size ... planets. In addition to discovering Barnard’s b — a completely different ...

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.

Pluto, considered the ninth planet in our ... Geoscience suggests a different origin story for Charon. Using simulations that took into account parameters like the size and composition of the ...