Amazing new research findings reported in the journal Science about the formation of the Earth and moon. The Earth formed 4.5 billion years ago. A hundred million years later, the Earth collided with a baby planet, Theia. The two planets melded together, but the intensity of the impact resulted in a chunk being torn off, which became the moon. The oxygen isotopes in the moon rocks, which were brought back by the Apollo missions, are the same as on Earth; therefore, supporting this theory. So, the Earth is two planets!
Since the moon is too small to have sufficient gravity to hold onto lighter molecules like oxygen and hydrogen, it lacks an atmosphere. Even the footprints of the first man on the moon, Neil Armstrong, have been preserved unchanged since 1969 due to the absence of an atmosphere.
Read more about the formation of the stars, planets, and the universe in Gnaritus: Every Life Matters.