NASA's GRAIL mission gives new clues to lunar impacts
Sen—Data from the lunar-orbiting twins of NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission are giving new insight into the asymmetric distribution of lunar impact basins.
Launched as GRAIL A and GRAIL B in September 2011, the probes, renamed Ebb and Flow, operated in a nearly circular orbit near the poles of the moon at an altitude of about 34 miles (55 kilometers) until their mission ended in December 2012.
"Since time immemorial, humanity has looked up and wondered what made the man in the moon," said Maria Zuber, GRAIL principal investigator from the Massachusetts Institute of Technology in Cambridge. "We know the dark splotches are large, lava-filled, impact basins that were created by asteroid impacts about four billion years ago. GRAIL data indicate that both the near side and the far side of the moon were bombarded by similarly large impactors, but they reacted to them much differently."
Most of the largest impact basins on the near side of the moon have been filled with lava flows, which hide important clues about the shape of the land that could be used for determining their dimensions. The GRAIL mission measured the internal structure of the moon in unprecedented detail for nine months in 2012.
With the data, GRAIL scientists have redefined the sizes of massive impact basins on the moon. Maps of crustal thickness generated by GRAIL revealed more large impact basins on the near-side hemisphere of the moon than on the far side, though both hemispheres were widely believed to receive the same number of impacts.
The abundances of the heat producing elements uranium and thorium are higher on the near side than the far side, and as a consequence, the temperatures of the near-side hemisphere of the moon were higher than those on the far side, so the vast majority of volcanic eruptions occurred on the moon's near-side hemisphere.
Moon Crustal Thickness. Image credit: NASA/JPL-Caltech/S. Miljkovic
"Impact simulations indicate that impacts into a hot, thin crust representative of the early moon's near-side hemisphere would have produced basins with as much as twice the diameter as similar impacts into cooler crust, which is indicative of early conditions on the moon’s far-side hemisphere," notes lead author Katarina Miljkovic of the Institut de Physique du Globe de Paris.
The new GRAIL research is also helping redefine the late heavy bombardment, a proposed spike in the rate of crater creation by impacts about 4 billion years ago. The late heavy bombardment is based largely on the ages of large near-side impact basins that are either within, or adjacent to the dark, lava-filled basins, or lunar maria, Oceanus Procellarum and Mare Imbrium. However, the composition of the material on and below the surface of the near side implies that the temperatures beneath this region were not representative of the moon as a whole at the time of the late heavy bombardment.
The difference in the temperature profiles would have caused scientists to overestimate the magnitude of the basin-forming impact bombardment. Work by GRAIL scientists supports the hypothesis that the size distribution of impact basins on the far-side hemisphere of the moon is a more accurate indicator of the impact history of the inner solar system than those on the near side.