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

The asteroid, known as 2022 RD2, belongs to a rare class of space rocks called Arjunas. These objects travel around the sun ...

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

The waxing crescent moon over the Walton Lighthouse in Santa Cruz, California, was beautiful all on its own. Then, it showed ...

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

The sun’s gravity would be pulling the moon away from Earth on November 20, 2025, at a distance that it had never been in the ...

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

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

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

About 4.5 billion years ago, a colossal impact between the young Earth and a mysterious planetary body called Theia changed everything—reshaping Earth, forming the Moon, and scattering clues across ...

If you know any bit of information about how the moon was created, new research indicates that everyone has believed wrong.

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