Big Splat

Birth of the Moon?

Making the Moon Anew

One of the solar system's most nagging problems literally stares into the collective faces of planetary scientists on many nights every month. It's the Moon — or, specifically, how it came to exist.

Two planets colliding

Three New Findings About the Moon

Researchers have announced interesting news concerning the Moon, especially about how and when it formed, and why the "Man in the Moon" constantly stares at us whenever the lunar disk is fully lit.

Formation of the Moon

When and How Did the Moon Form?

New studies offer contrasting scenarios for making the Moon. One argues for a one big splat early in solar-system history; a second envisions a score of lesser blows that built up the Moon over time; and a third suggests water was involved.