Jan. 20, 2013, Tucson, Ariz. — The subsurface environment on Mars may hold clues to the origin of life, scientists argue in a recently published research article led by Planetary Science Institute’s Joseph Michalski. A large fraction of the life on Earth may exist as microbes deep underground on our home planet. The same could have been true in the past on Mars.

“Recent results produced by several authors using data from the Compact Reconnaissance Imaging Spectrometer for Mars instrument aboard NASA’s Mars Reconnaissance Orbiter have shown that the subsurface of Mars was widely altered by subsurface water” Michalski said. “Here, we argue that all of the ingredients for life existed in the subsurface, and it may have been the most habitable part of Mars.”

In some cases, those deep fluids, which could have harbored life, have emerged from the subsurface in deep basins, he said.

Michalski found that McLaughlin Crater, one of the deepest craters on Mars, contains evidence of clays and carbonates that probably formed in an alkaline, groundwater-fed lake.

McLaughlin Crater has a diameter of 57 miles and a depth of 1.4 miles.

“Taken together, the observations in McLaughlin Crater provide the best evidence for carbonate forming within a lake environment instead of being washed into a crater from outside. It would have been an alkaline lake, a habitable environment for microbial life,” said PSI Research Scientist Michalski, lead author of the recently published Nature Geosciences paper “Groundwater Activity on Mars and implications for a deep biosphere.”

“The most interesting aspect of Mars science, perhaps, is that the planet might provide a window into our own past. The environmental conditions on Earth and Mars were likely similar early on, at least in the subsurface,” Michalski said. “Exploring those rocks on Mars would be like finding a stack of pages that have been ripped out of Earth’s geologic history book. Whether they contain life or not, they would certainly teach us a tremendous amount about early chemical processes in the solar system.”

This research was funded by a grant to PSI from NASA’s Mars Data Analysis Program.

Images may be found athttp://www.psi.edu/news/press-releases/michalski_012013

THE PLANETARY SCIENCE INSTITUTE:

The Planetary Science Institute is a private, nonprofit 501(c)(3) corporation dedicated to solar system exploration. It is headquartered in Tucson, Arizona, where it was founded in 1972.

PSI scientists are involved in numerous NASA and international missions, the study of Mars and other planets, the Moon, asteroids, comets, interplanetary dust, impact physics, the origin of the solar system, extra-solar planet formation, dynamics, the rise of life, and other areas of research. They conduct fieldwork in North America, Australia and Africa. They also are actively involved in science education and public outreach through school programs, children’s books, popular science books and art.

PSI scientists are based in 18 states and the District of Columbia, Australia, Canada, Ireland, Latvia, Russia, South Africa, Switzerland and the United Kingdom.

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