The branch conducts interdisciplinary basic research in exobiology to understand pre-biotic chemistry, and the origin, evolution, distribution, and future of life in the Universe. We provide an interface between the external academic community and NASA programs. Our work also informs the selection, design and development of NASA life detection missions; the design and fabrication of spaceflight instruments to evaluate habitability and detect biosignatures; and the interpretation of astrobiology mission and astronomical data.
The CheMin Instrument
The Exobiology Branch is home to David Blake, the Principal Investigator for the CheMin instrument on the Mars Science Laboratory, scheduled for launch in 2011.
The CheMin instrument utilizes X-ray diffraction and flourescence to provide difinitive minerology of rock samples (both elemental analysis and crystal structure determination).
Early Habitable Environments and the Evolution of Complexity
The Exobiology Branch is home to David Des Marais, the Principal Investigator of the NASA Astrobiology Institute (NAI) Ames Team, which focuses on Early Habitable Environments and the Evolution of Complexity. The overarching goal of this scientific program is to understand the creation and distribution of early habitable environments in emerging planetary systems. The Ames Team provides a program of integrative, mission-enabled and mission-enabling research on habitability and a thematically related program of education and public outreach focused around informal education in high-impact venues. Andrew Pohorille, Tori Hoehler, and Sandy Dueck are also members of the Exobiology Branch and hold key roles as Lead Co-Investigators on the team. To learn more about the NAI Ames Team, visit their website at www.amesteam.arc.nasa.gov.
Origin of Life Research
For nearly 40 years, the Exobiology Branch at Ames has been the main center for origins of life research at NASA, and a world leader in this scientific area. Currently, the branch has the unique feature of being the only center within the NASA Astrobiology Program that has a sustained, long-term program of theoretical and computational studies on the origins of life. This research program, which contains both molecular and system-level components, is leveraged by the supercomputing facilities at Ames and by Ames’ status as the NASA lead center in information science and technology.
The image shown above is the cover art for the latest issue of the Journal of Physical Chemistry, highlighting an article by Andrew Pohorille, a Principal Investigator in the Branch, with co-authors Christopher Jarzynski and Christophe Chipot, titled “Good practices in free-energy calculations”. From the abstract: “As access to computational resources continues to increase, free-energy calculations have emerged as a powerful tool that can play a predictive role in a wide range of research areas. … In this contribution, the current best practices for carrying out free-energy calculations using free energy perturbation and nonequilibrium work methods are discussed demonstrating that, at little to no additional cost, free-energy estimates could be markedly improved and bounded by meaningful error estimates.”
Dr. Pohorille is also the recepient of this year’s H. Julian Allen Award, bestowed by NASA Ames for best research paper. Titled “Calculating free energies using average force”, the paper appeared in the Journal of Chemical Physics (co-author Eric Darve), Volume 115, Number 20, November 2001. According to the Citation Index in the Web of Science the paper has been cited 111 times as of March 2010. From the abstract: “A new, general formula that connects the derivatives of the free energy along the selected, generalized coordinates of the system with the instantaneous force acting on these coordinates is derived. The instantaneous force is defined as the force acting on the coordinate of interest so that when it is subtracted from the equations of motion the acceleration along this coordinate is zero. The formula applies to simulations in which the selected coordinates are either unconstrained or constrained to fixed values.”
The Branch is also home to Dr. Arthur Weber, a SETI Institute researcher, who works together with his wife Esther to study the pre-biotic chemistry of sugars, and how these molecules may have led to the origin of life.
The Branch is housed in Building 239 at NASA Ames Research Center. Laboratory facilities available include analytical equipment for the characterization of gas and aqueous chemistry, instruments for the detection of various biomarkers including sugars and organics, microbiology facilities including the culture of microbial mat communities, electron and RAMAN microscopes, a molecular biology suite, and informatics computational capabilities.
Code SSX Highlights
The BBC News (9/16, Amos, 1.62M) reports continued coverage of the “intense science” the Curiosity rover will conduct now that it arrived at its first waypoint. While the rover is still “many months” away from its ultimate destination of Mount Sharp, the article notes that operators are “delighted” by how Curiosity is handling. The article […]
Ames researcher microbiologists (Bebout Exobiology lab) have successfully completed first phase assessment of a UC Santa Cruz developed technology “wave selective photovoltaics.” Using an led solar simulator and greenhouse rooftop facilities atop B239, tests were run on five commercially important algal strains (which are also of interest for space missions). Results showed that all strains […]
NASA Continues Celebrations Of Curiosity Rover. Coverage continues of the one-year anniversary of the Curiosity rover landing on Mars. Compared to the previous day, coverage has expanded to included two and a half minutes of coverage on national TV broadcasts. The tone of that coverage was overwhelmingly positive with a focus on the achievements of […]
SPACE (7/25, Wall) reports on Sunday, the Curiosity rover traveled 329 feet, more than doubling the previous one-day travel record of 161 feet. Paolo Bellutta of the Jet Propulsion Laboratory said, “What enabled us to drive so far on Sol 340 was starting at a high point and also having Mastcam images giving us the […]
David Blake (PI, CheMin instrument, SSX) conducted field geology with a group of 25 high school teachers in northern Arizona, June 24-28th. Blake’s participation was part of the CheMin team’s education outreach effort, which included Co-I’s Jack Farmer (Arizona State University) and Bob Downs (University of Arizona). Sheri Klug Boonstra and Jack Farmer of ASU […]
The CheMin instrument on MSL was exhibited at the 2013 Bay Area Maker Faire May 18 – 19, 2013, and received an “Editor’s Choice” award at the end of the activities. The exhibit consisted of a rapid prototype model of the flight instrument, various early prototypes developed at Ames, as well as a commercial spinoff […]
SPACE (5/1, Wall) reports, “Three spectacular new panoramas give an eye-popping look at NASA’s Mars rover Curiosity hard at work on the Red Planet.” Ken Kremer and Marco Di Lorenzo created the images, which “help paint a picture of Curiosity and its mission.” Kremer said, “I chose these scenes because they vividly tell the story […]
The Pasadena (CA) Star-News (5/1, Figueroa) continues coverage of how the Opportunity rover entered safe mode last week even as all the rovers “are emerging from a month-long communications hiatus this week.” The Curiosity rover is scheduled to become fully operational once it connects with Jet Propulsion Laboratory operators today. […]
Curiosity Engineers, Scientists Getting Needed Time Off With Solar Conjunction. The Pasadena (CA) Star-News (4/5, Figueroa) reports how the Curiosity rover is now “operating under a stored set of commands” until May 1 because of a solar conjunction. Kimberly Lichtenberg, system engineer for the Curiosity’s Sample Analysis at Mars instrument, said, “Everything that the rover […]
“Microbes may have once happily existed on the surface of Mars, according to chemical analysis of a sedimentary rock in the Red Planet’s Gale Crater. NASA geologist and exobiologist David Blake discusses evidence for an ancient freshwater lake in the crater, and describes the mineral-chomping microbes that might have thrived there.” http://www.sciencefriday.com/segment/03/15/2013/curiosity-hits-paydirt-new-clues-to-life-on-mars.html […]