Small icy moons in the outer reaches of our solar system may hide boiling oceans underneath their surfaces, a new study finds ...

The outer planets of the solar system are swarmed by ice-wrapped moons. Some of these, such as Saturn's moon Enceladus, are ...

Discover how scientists have used iron isotopes to determine the likely origin of the Mars-sized planet named Theia.

"The most convincing scenario is that most of the building blocks of Earth and Theia originated in the inner solar system.

Roughly four and a half billion years ago the planet Theia slammed into Earth, destroying Theia, melting large fractions of ...

New research suggests that Theia, the object whose collision with Earth is theorized to have caused the formation of the moon ...

Space has a knack for bending our sense of scale. The Moon feels close enough to touch—after all, we see its craters with ...

New research shows that Theia, the planet that collided with Earth and formed the Moon, was a rocky world born closer to the ...

Theia, the world that helped form the Moon, came from the Solar System. Chemical clues in Earth and Moon rocks reveal this ...

Astronomers recently detected a stray quasi-moon in our planet’s orbit, but it's hardly the first stowaway to hang out around ...

One fateful day about 4.5 billion years ago, a Mars-sized body called Theia collided with proto-Earth, turning both into a ...

Scientists traced the Moon's parent planet Theia to the inner Solar System, solving a 4.5-billion-year mystery.