This paper considers the lithopanspermia hypothesis in star-forming groups and clusters, where the chances of biological material spreading from one solar system to another is greatly enhanced (relative to action in the field) because of the close proximity of the systems and lower relative velocities. These effects more than compensate for the reduced time spent in such crowded environments. T...

--___-___-__„___-_-_______________________ Introduction.. _ _____________________________________ Stratigraphic Summary__________________________ Mesozoic and older rocks in Esso Standard Oil Co. Hatteras Light well No. 1___________________ Mesozoic rocks in Esso Standard Oil Co. North Carolina Esso well No. 2______________________ Stratigraphic distribution of the Ostracoda________ Systematic ...

Microorganisms group themselves into assemblies known as communities or biofilms, which are associated with surfaces. A matrix of self-segregated polymeric substances enhances their attachment. Communication between bacterial cells involves the production and detection of diffusible signal molecules, known as quorum sensing, which is an important regulatory mechanism of biofilm strategies. Biof...

Stimulated infrared emission from rocks: assessing a stress indicator F. T. Freund, A. Takeuchi, B. W. S. Lau, A. Al-Manaseer, C. C. Fu, N. A. Bryant, and D. Ouzounov Ecosystems Science and Technology Branch, Code SGE, NASA Ames Research Center, Moffett Field, 94035-1000, CA, USA Department of Physics, San Jose State University, San Jose, 95192-0106 CA, USA SETI Institute, Mountain View 94043, ...

[1] Definitive exposures of pristine, ancient crust on Mars are rare, and the finding that much of the ancient Noachian terrain on Mars exhibits evidence of phyllosilicate alteration adds further complexity. We have analyzed high-resolution data from the Mars Reconnaissance Orbiter in the well-exposed Noachian crust surrounding the Isidis basin.We focus on data from the Compact Reconnaissance I...

Introduction: The Onboard Autonomous Science Investigation System (OASIS) evaluates geologic data gathered by a planetary rover [1]. This analysis is used to identify new science opportunities during a rover traverse. A planning and scheduling component enables new science measurements to be safely added to the rover current command sequence. Recent tests have highlighted the identification of ...

Archean Quartzose Rocks at Akilia, Greenland Fedo and Whitehouse (1) presented data to support their hypothesis that granulite grade quartz magnetite rocks on the island of Akilia, southwest Greenland—which are conformably interposed with pyroxenite and hornblendite units that date from before 3830 million years ago (Ma) (2–4)—had a metasomatic ultramafic igneous origin. They offered that inter...

Analysis of the abundance of ejecta boulders Z2 m in diameter on the rims of twelve lunar craters (150– 950 m in diameter) of known formation ages (2–300 Ma) led to estimates of the survival times of metersized boulders against collisional destruction on the Moon. The median survival time, when 50% of the original rock population 42 m was destroyed, is about 40–80 Ma, while the 99% survival tim...

logues rocks during entry into the Earth’s atmosphere F. Foucher, F. Westall , J.-M. Bény , F. Brandstätter , and R. Demets , 1 Centre de Biophysique Moléculaire, UPR CNRS 4301, Orléans, France ([email protected]), 2 Institut des Sciences de la Terre d’Orléans, UMR CNRS 6113, Orléans, France, 3 Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, 4 European Space & Technolog...

Bastnaesite, a rare-earth fluocarbonate, was found in the Mountain Pass district in April 1949. Subsequent geologic mapping has shown that rare-earth mineral deposits occur in a belt about 6 miles long and iy2 miles wide. One of the deposits, the Sulphide Queen carbonate body, is the greatest concentration of rare-earth minerals now known in the world. The Mountain Pass district is in a block o...