The moon has been Earth's constant companion for approximately 4.5 billion years, escorting the planet during its myriad journeys around the sun. While its origins are a little hazy - it cannot be ...

Approximately 4.5 billion years ago, a planet called Theia slammed into the Earth. The impact melted parts of Earth’s mantle and sent a massive cloud of debris into space. Over time, this debris came ...

About 4.5 billion years ago, the most momentous event in the history of our planet occurred: a huge celestial body called Theia collided with the young Earth. How the collision unfolded and what ...

An artist’s impression of the Earth–Theia impact, with the Sun in the background, illustrating the idea that Theia originated close to the Sun. A study led by Professor Nicolas DAUPHAS of the ...

LONDON — A long-lost planet that helped create the Moon may have formed much closer to the Sun than scientists once thought, according to new research. Scientists have discovered that Theia, the ...

Add Yahoo as a preferred source to see more of our stories on Google. 'Theia' is a long-vanished world, a planet-sized body thought to have smashed into the early Earth and that helped to form the ...

Scientists have long believed that the Moon was formed by a massive object crashing into the Earth billions of years ago and sending chunks hurtling into space that ultimately coalesced. But what was ...

A powerful magnitude 6.0 earthquake struck Hawaiʻi island Friday night — shaking homes across the state, damaging property in South Kona and startling residents from Hilo to Hanalei.