The Moon is thought to have been formed after a collision between Earth and a Mars-sized object, called Theia. According to Big Splash, or the Theia Impact, the Moon was formed from the ejecta of a collision between the proto-Earth and a Mars-sized planet, approximately 4.5 billion years ago, in the Hadean eon. But now, a simulation of the event created using supercomputer by
One of the more commonly accepted theories among space scientists speculating on how the Earth’s moon was formed is that a young planet about the size of Mars – now called Theia collided with our young planet, breaking itself into two pieces with one hurling into space to become our satellite while the rest. Read more »