William Hartmann

William Hartmann is an American planetary scientist known for his work in studying the early history of the solar system. He contributed to the giant impact hypothesis, which explains how Earth's Moon formed from a collision between Earth and a Mars-sized body. Hartmann's research has helped scientists understand planetary formation and the dynamic processes that shaped our solar system billions of years ago. His work combines observations, simulations, and geology to reveal how planets and moons develop over time.