Meteorites, microfossils, and exobiology



Publisher: Society of Photo-Optical Instrumentation Engineers, Publisher: National Aeronautics and Space Administration, Publisher: National Technical Information Service, distributor in Bellingham, Wash, [Washington, D.C, Springfield, Va

Written in English
Published: Downloads: 403
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Subjects:

  • Meteorites,
  • Fossils,
  • Microstructure,
  • Biochemistry,
  • Carbonaceous chondrites,
  • Contaminants,
  • Meteorite collisions,
  • Microorganisms

Edition Notes

In this study, microfossils from a suite of sedimentary rock samples of various ages were analyzed with micro Raman spectroscopy to investigate the nature and provenance of carbonaceous material. To further constrain D- and G-band carbon characteristics, micro Raman analyses were also performed on well-characterized meteorite samples as Cited by: In this paper, we provide a brief review of prior evidence for microfossils in meteorites and present Scanning and Environmental Scanning Electron Microscope (SEM and ESEM) and Field Emission Scanning Electron Microscope (FESEM) images of microfossils found in-situ in freshly fractured surfaces of the Murchison and Rainbow meteorites. Of these figures, only R* is well known from astrophysical studies. Astrobiology is a newly emerging multidisciplinary field triggered by paradigm shifts resulting from discoveries regarding microbial extremophiles and evidence for possible microfossils in the Mars meteorite discovered on 3/5. Further evidence of microfossils in carbonaceous meteorites Further evidence of microfossils in carbonaceous meteorites Hoover, Richard B.; Rozanov, Alexei Y.; Zhmur, Stanislav I.; Gorlenko, Vladimir M. ABSTRACT Scanning electron microscopy investigations carried out independently in the United States and Russia have yielded further evidence of microfossils in meteorites.

  The connection between space exploration and astrobiology (then called exobiology) was highlighted and given early legitimacy by molecular biologist-turned-exobiologist Joshua Lederberg. Even before NASA was formally established, he was reaching out to colleagues about the possibilities of finding life beyond g: microfossils. Figure 1. Microfossils in the Orgueil meteorite in morphology and size consistent a Microcoleus sp. (multiple trichomes within a common sheath) and Phormidium sp. (uniseriate trichome) mat. These two genera of cyanobacteria often grow together forming mats at the bottom of ice-covered lakes and permafrost in Siberia and Antarctica The Origin of SNC Meteorites 96 The Martian Meteorites 97 Exobiology and the Martian Meteorites 98 Carbon Compounds in Other Meteorites (Carbonaceous Chondrites) Carbon Compounds in Micrometeorites II.4 Team I: Exobiology and the Mars Surface Environment Environments and Rocks with Exobiology Potential Murchison Meteorite. Resources. The Murchison meteorite was a type II carbonaceous chondrite meteorite that entered the Earth ’ s atmosphere in September The meteor fragmented before impact and remnants were recovered near Murchison, Australia (located about 60 mi [ km] north of Melbourne). The fragments recovered dated to nearly five billion years .

Instruments, methods, and missions for astrobiology: July , San Diego, California. psychrophiles --Nanobacteria --Ancient terrestrial and marine microorganisms --Biomarkers and microfossils in rocks and meteorites --Viability and transport of microorganisms in the space methods, and missions for astrobiology: July   Before unambiguous biosignatures can be established, further work characterizing the carbonaceous material in microfossils of different ages, thermal histories, and host rock compositions is needed. Key Words: Raman spectroscopy—Microfossils—Biosignatures—Carbonaceous material—Thermal history. Cited by: A brand new ~ page hard back book on the Lower Permian Vertebrates of Waurika. 4 Pages of microfossils, brachiopods, matrix samples and Chitinozoa. Specimens of the rare EL3 classification Al Haggounia fossil meteorite. Meteorites from Mars have been scrutinized for evidence of past life • A Martian rock that came to Earth as a meteorite was examined for circumstantial evidence that microorganisms once existed on Mars • The science community does is skeptical, and more samples are needed for additional evidenceFile Size: 4MB.

Meteorites, microfossils, and exobiology Download PDF EPUB FB2

Meteorite impact-ejection and comets provide mechanisms for planetary cross-contamination of biogenic chemicals, microfossils, and living microorganisms. Hence, previously dismissed evidence for complex indigenous biochemicals and possible microfossils in carbonaceous chondrites must be re-examined.

Meteorite impact-ejection and comets provide mechanisms and exobiology book planetary cross-contamination of biogenic chemicals, microfossils, and living microorganisms. Get this from a library. Meteorites, microfossils, and exobiology.

[Richard B Hoover; United States. National Aeronautics and Space Administration.]. Meteorite impact-ejection and comets provide mechanisms for planetary cross-contamination of biogenic chemicals, microfossils, and living microorganisms.

Hence, previously dismissed evidence for complex indigenous biochemicals and possible microfossils in carbonaceous chondrites must be re- by: Meteorite impact-ejection and comets provide mechanisms for planetary cross-contamination of biogenic chemicals, microfossils, and living microorganisms.

Hence, previously dismissed evidence for complex indigenous biochemicals and possible microfossils in carbonaceous chondrites must be re-examined. Meteorites, Microfossils, and Exobiology Richard B.

Hoover Space Science Laboratory, ES George C. Marshall Space Flight Center, AL ABSTRACT The discovery of evidence for biogenic activity and possible microfossils in a Martian meteorite may have initiated a paradigm shift regarding the existence of extraterrestrial microfossils life.

Nanofossils and microfossils carried to Earth in meteorites could stimulate the newly emerging field of Exopaleontology and provide guidance for the development of instruments and missions which will seek additional evidence for living and fossil organisms on other planets, satellites, comets, and asteroids.

Meteorites, microfossils, and exobiology Terrestrial extremophiles that live in deep granite and hydrothermal vents and nanofossils in volcanic tuffs have altered the premise that microbial life and microfossils are inconsistent with volcanic activity and igneous rocks. Current Aspects of Exobiology covers the philosophical aspects, scientific approach, microfossils related research problems in exobiology.

Most of the chapters are presented at the Current Research in Exobiology Symposium, held at the Jet Propulsion Laboratory on FebruaryMissing: microfossils. Planet Mars and the SNC Meteorites 15 Jupiter’s Moon Europa 17 Saturn’s Moon Titan 18 The Search for Life Beyond the Solar System 19 The Search for Rocky Earthlike Exoplanets 19 Detecting Extrasolar Life 20 Conclusions 20 And exobiology book Reading 21 Books and Articles in Books 21 Articles in.

Panspermia Martian meteorites Both have possible fossil evidence of life on Mars Living cyanobacteria. Microfossils in carbonaceous Time to think Work out Exercise I.

When, Where microfossils How. in the class activity Origins of Life on Earth. Early Evolution and Rise of. About this Journal Meteoritics & Planetary Science publishes research articles describing the latest results of new studies, invited reviews of major topics in planetary science, editorials on issues of current interest in the field, and book include the origin and history of the solar system, planets and natural satellites, interplanetary dust and interstellar medium, lunar.

Astrobiology is a newly emerging multidisciplinaiy field concerned with the limitations and distribution of life on Earth and in the Cosmos. The discovery of chemical and mineral biomarkers and possible microfossils in the Allen Hills meteorite (ALH) indicated that microbial life may have existed on Mars more than 3 billion years by: 9.

Microfossils and Biomolecules in Meteorites – Dr. Richard B. Hoover. This video by Dr. Richard B. Hoover points at why I am so interested in meteorites. Imagine if Dr. Hoover is correct and that life pervades the universe, or even lets say a.

Request PDF | Indigenous microfossils in carbonaceous meteorites | Indigenous embedded microbial filaments, bacterial cells and other microfossils were. On Jin San Diego, Richard B. Hoover of NASA's Marshall Space Flight Center announced an important finding.

He had seen and photographed in the Murchison meteorite microfossils that resemble microorganisms. The fossils were seen in freshly broken pieces of the meteorite, so the chance that they were earthly contaminants is low.

In contrast, exobiology extends the boundaries of biological investigations beyond the Earth, to other planets, comets, meteorites, and space at large.

To date, the over-riding objective of exobiological research has been to attain a better understanding of the principles leading to the emergence of life from inanimate matter, its evolution.

The recent discovery of possible microfossils in ALH has generated another round in the debate about life in meteorites and/or comets.

The claims that meteorites contain organic structures is as old as the study of meteorites and has led to at least three possible interpretations of the data: 1) organic compounds are of abiotic origin, but. Chiral biomarkers and microfossils in carbonaceous meteorites.

Richard B. Hoover* Space Science Office, Mail C NASA/Marshall Space Flight Center, Huntsville, AL ABSTRACT. Homochirality of the biomolecules (D-sugars of DNA and RNA and L-amino acids of proteins) is a fundamental property of all life on Size: 1MB. Images are provided of framboidal magnetites in oil shales and meteorites and images and 2D x-ray maps are shown of bacterial microfossils embedded in the mineral matrix of the Murchison, Rainbow and Tagish Lake Carbonaceous Meteorites.

These microfossils exhibit characteristics that preclude their interpretation as post-arrival contaminants Cited by: 8. — Discovery of meteorites in a small area of Antarctica leads to annual expeditions by U.S.

and Japanese teams. – — Meteorites from the Moon and Mars are identified in Antarctic collections. — A team of NASA scientists suggests that martian mete-orite ALH may contain evidence of microfossils from Mars,File Size: KB. Richard Brice Hoover is a scientist who has authored/edited ~50 scientific books and over research papers on X-Ray/EUV optics, Solar Physics, Astrophysics, Diatoms, Microbial Extremophiles.

Meteorites, microfossils, and exobiology Richard B. Hoover Proc. SPIEInstruments, Methods, and Missions for the Investigation of Extraterrestrial Microorganisms, pg (11 July ); doi: / microfossils in carbonaceous meteorites was initiated by the author at the NASA/Marshall Space Flight Center.

2 An independent search for microfossils in carbonaceous meteorites had also been carried out by Alexei by: 6. Meteorit Planet Sci. Jul;33(4) Martian "microfossils" in lunar meteorites. Sears DW(1), Kral TA. Author information: (1)Department of Chemistry and Biochemistry, University of Arkansas, FayettevilleUSA.

[email protected], One of the five lines of evidence used by McKay et al. () for relic life in the Martian meteorite Allan Hills (ALH) was Cited by: The Murchison meteorite was a meteorite that entered Earth's atmosphere in September The meteor fragmented before impact and remnants were recovered near Murchison, Australia (located about 60 mi [ km] north of Melbourne).

The fragments recovered dated to nearly five billion years ago—to the time greater than the estimated age of addition to interest. Scientists from Cardiff University with colleagues from Sri Lanka and the United States are claiming that they have found microfossils in a meteorite.

SinceRichard B. Hoover has published numerous papers describing controversial evidence and claims for the existence of indigenous microfossils of cyanobacteria and other filamentous microorganisms in the CI1 (Ivuna and Orgueil) and CM2 (Murchison and Murray) carbonaceous meteorites, as well as the Polonnaruwa meteorite.

Hoover's interpretations and claims for. Incomplex hydrocarbons, kerogens, microfossils, and amino acids were reported in carbonaceous meteorites. 1,2 The small, spherical microfossils had indeterminate biogenicity. One of the stones of the Orgueil meteorite was intentionally contaminated.

3 The suggestion of a hoax effectively terminated all searches for meteorite microfossils untilwhen. Of the 24 reviews so far published on the Journal of Cosmology website, 10 many are positive, many are off-topic, and a few are cautious. There is one so far, however, that would perhaps count as ‘scathing’: that of Martin Brasier, a world expert on identifying true microfossils from abiogenic pseudofossils.

11 Unsurprisingly, he is the most qualified of all the reviewers thus. Astrobiology, formerly known as exobiology, is an interdisciplinary scientific field concerned with the origins, early evolution, distribution, and future of life in the iology considers the question of whether extraterrestrial life exists, and if it does, how humans can detect it.

Astrobiology makes use of molecular biology, biophysics, biochemistry, chemistry, astronomy.Possible Microfossils Found in Murchison Meteorite posted on the Usenets by Ron Baalke, J At the SPIE conference being held at San Diego this week, Richard Hoover from Marshall Space Flight Center presented a paper claiming he has found possible microfossils in the Murchison son is a CM2 (carbonaceous chondrite meteorite."Life in the Universe, a beginners guide" by Lewis Dartnell is a decent overview of the subject for a general reader.

"Planets and Life, the emerging science of astrobiology" edited by Woodruff T Sullivan III and John A Baross is a much more comprehensive Missing: microfossils.