Ancient Asteroid Impacts Exposes the Moon's Interior

Melosh’s group used remote sensing to identify what minerals compose the splashed-up material. When sunlight hits the moon, it interacts with materials on the surface; because different materials absorb different wavelengths of light, researchers can tell what materials are on the surface by looking at the reflected signal.

“This is a really important tool to understand the surface of the moon without touching it,” said Briony Horgan, an assistant professor of planetary science at Purdue, who worked on the study. “Before we can send a rover or a spacecraft somewhere, we need to be able to map the surface.”

To make sure they were looking for the splashed material in the right place, the research team created a three-dimensional simulation of the asteroid’s collision with the moon. If the moon’s upper mantle was mostly olivine, that spectral signature would be visible over large parts of the most elevated region of the moon (the highlands). Instead, the researchers found large quantities of orthopyroxene in the highlands and interior of the South Pole-Aitken basin. Olivine is present in those regions too, but it isn’t the dominant component, as was previously assumed.

A sample of the Earth’s upper mantle appears mostly green (olivine) with specks of black (orthopyroxene). It’s likely the moon’s mantle is just the opposite. These new findings will force scientists to rethink their models for the formation and evolution of the Moon and why it might be different from Earth.

“We’re overturning conventional wisdom about what makes up the interior of the moon and, by extension, maybe what makes up the interiors of other planets,” Melosh said.

Kayla Zacharias
Purdue University

Citation: South Pole-Aitken basin ejecta reveal the Moon’s upper mantle in the Journal Geology.