Alien Remnants on Moon Provide Proof of Its Violent Origin

An artist’s rendering shows a planetary collision near the star Vega. The moon may have formed from the debris of such an impact between Earth and a Mars-sized body. Credit: NASA Despite sometimes studying objects literally trillions of miles away, astronomers still have plenty of unanswered questions about the moon, which is basically right there. Even as basic a question as where it came from remains unclear, though a well-explored theory suggests that it arose from a colossal collision deep in Earth’s past. A new study this week finally has some proof to back that up: Researchers have detected rubble from a foreign body in the moon's makeup.