The South Pole-Aitken basin is the darker area at the bottom of this image.
Credit: Photo by NASA/Goddard Space Flight CenterScientific Visualization Studio
Scientists have long assumed that all the planets in our solar system look the same beneath the surface, but a study published in Geology on Oct. 4 tells a different story.
Around 4 billion years ago, an asteroid collided with the moon and created the largest and deepest impact on the moon: the South Pole-Aitken basin. The collision exposed lunar mantle in the basin and splashed up material onto the far side of the moon.
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 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.
Story Source: Materials provided by Purdue University Original written by Whitney Clavin.Note: Content may be edited for style and length.
H.J. Melosh, J. Kendall, B. Horgan, B.C. Johnson, T. Bowling, P.G. Lucey, G.J. Taylor. South Pole–Aitken basin ejecta reveal the Moon’s upper mantle. Geology, 2017; DOI: 10.1130/G39375.1