Home > Astronomy, Mercury, MESSENGER (MErcury Surface, Solar System, Spaceflight, Unmanned Spaceflight > New Insights Concerning The Early Bombardment History On Mercury

New Insights Concerning The Early Bombardment History On Mercury


The surface of Mercury is rather different from those of well-known rocky bodies like the Moon and Mars. Early images from the Mariner 10 spacecraft unveiled a planet covered by smooth plains and cratered plains of unclear origin. A team led by Dr. Simone Marchi, a Fellow of the NASA Lunar Science Institute located at the Southwest Research Institute (SwRI) Boulder, Colo., office, collaborating with the MESSENGER team, including Dr. Clark Chapman of the SwRI Planetary Science Directorate, studied the surface to better understand if the plains were formed by volcanic flows or composed of material ejected from the planet’s giant impact basins.

Recent images from NASA’s MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) spacecraft provided new insights showing that at least the younger plains resulted from vigorous volcanic activity. Yet scientists were unable to establish limits on how far into the past this volcanic activity may have occurred, or how much of the planet’s surface may have been resurfaced by very old volcanic plains.

“By comparing the measured craters to the number and spatial distribution of large impact basins on Mercury, we found that they started to accumulate at about the same time, suggesting that the resetting of Mercury’s surface was global and likely due to volcanism,” said lead author Dr. Simone Marchi, who has a joint appointment between two of NASA’s Lunar Science Institutes, one at the SwRI in Boulder and another at the Lunar and Planetary Institute in Houston.

Full Story: http://www.swri.org/9what/releases/2013/mercury.htm#.UdmK1n4o5hE

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