According to the leading theory of how the Earth-Moon system formed (the Giant Impact Hypothesis), a Mars-sized object (named Theia) collided with a...

Theia also brought water to Earth.

Theia also brought water to Earth.

A new isotopic study reveals that Theia-the Mars-sized body that struck Earth 4.5 billion years ago to form the Moon-likely originated in the inner...

A new isotopic study reveals that Theia-the Mars-sized body that struck Earth 4.5 billion years ago to form the Moon-likely originated in the inner...

New research suggests Earth's Moon formed from the catastrophic collision of our planet with its "sister" planet, Theia, born nearby. This "sibling"...

The Moon has always held a certain mystery, from influencing tides to inspiring mythology, poetry and scientific inquiry. For decades, astronomers...

A collision between Earth and a massive Mars-sized protoplanet likely caused the formation of our moon. Now scientists from the Max Planck Institute...

A collision between Earth and a massive Mars-sized protoplanet likely caused the formation of our moon. Now scientists from the Max Planck Institute...

Another mini moon, but this one's different. Scientists have spotted a small asteroid that may circle Earth as a mini moon before shifting onto a path...