Moon rock analysis

The age of the Moon

Analysis of lunar rocks suggests the Moon is almost as old as Earth, meaning the collision happened within Earth’s first 100 million years.

Matching oxygen isotopes

The relative abundances of the three stable isotopes of oxygen are the same on Earth and the Moon, suggesting a common origin.

No sign of water

The Moon rocks show no signs of past interaction with water. All the geology can be explained as rocks being under pressure.

Differing potassium isotopes

There is slightly more of one particular potassium isotope on the Moon, pointing to it being vaporised during a headon collision.