Ancient asteroid impact exposes the moon's interior

October 5, 2017 by Kayla Zacharias, Purdue University
Far side of the moon. The South Pole-Aitken basin is the darker area at the bottom of this image. Credit: 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.

"The of the earth is made mostly of a mineral called olivine, and the assumption is usually that all planets are like the Earth," said Jay Melosh, a professor of earth, atmospheric and planetary sciences at Purdue University, who led the study. "But when we look at the spectral signature of rocks exposed deep below the 's , we don't see olivine; we see orthopyroxene."

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 to identify what minerals compose the splashed-up material. When sunlight hits the moon, it interacts with 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 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 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.

Explore further: Moon may harbour alien minerals, study says

More information: H.J. Melosh et al. South Pole–Aitken basin ejecta reveal the Moon's upper mantle, Geology (2017). DOI: 10.1130/G39375.1

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Shootist
not rated yet Oct 05, 2017
SP-Aitken is actually two craters.

Would anyone care to speculate why this largest of lunar basins is the only one not filled with KREEP?

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