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 ...

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 ...

If you were to peer deep under Earth's crust, you'd spot two giant blobs of rock cupping the planet's core like a pair of hands. The source of these mysterious continent-sized formations — one under ...

There may be chunks of an ancient planet trapped in Earth’s mantle. The prevailing theory of the moon’s formation is called the giant impact hypothesis, in which a Mars-sized object called Theia ...

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 ...

An alien planet collided into Earth some 4.5 billion years ago. The New York Public Library A Mars-sized planet that struck Earth 4.5 billion years ago and gave birth to the moon may have left two ...

Scientists from the Durham University and University of Glasgow worked together in developing simulations using supercomputers that may explain how the Moon may have formed after a collision between ...