On 7/3/2015 2:06 PM, Mark Isaak wrote:
> On 7/2/15 3:31 PM, jonathan wrote:
>>
>> Please explain how erosion could create these spheres?
>> And look closely at them, some look pristine, not
>> eroded at all.
>>
>>
http://mars.nasa.gov/mer/gallery/all/1/m/182/1M144339407EFF3370P2907M2M1.HTML
>>
>
> The round and irregular ones are from two different sources.
>
> Incidentally, the snowman-like pebble shows that the roundness is from
> concretion, not erosion, at least not entirely from erosion. My guess
> is that it is a chemical accretion process, with wind shifting the
> pebbles enough for concretion to occur fairly uniformly on all surfaces.
> Note that this could also explain the irregular stones; they were not
> round enough to get shifted by the wind.
>
Hurricane wind speeds on Mars would feel like a 10 mph
breeze on Earth. The air is 100 times thinner.
Mars wind can raise dust off the surface, but
moving pebbles would be pretty much impossible.
http://passporttoknowledge.com/lfm/ask/atmosphere/Feel_of_Wind_on_Mars.txt
It's thought they formed in wet soil, so the water would
tend to be stationary.
Keep in mind erosional forces tend to produce a wide range
of sizes and shapes, in this picture the spheres
look remarkably identical in shape and size. That argues
strongly against erosional forces, whether wind or water.
And there's just too many of them
http://areo.info/mer/opportunity/180/1P144166325EFF3342P2537L5M1_L4L5L5L5L6.jpg
The pic below is a crater wall with a significant slope
yet they don't settle at the bottom.
http://areo.info/mer/opportunity/123/tn/1P139098299EFF2809P2267L5M1_L2L5L5L6L6.jpg.html
I haven't Googled recently for research on the
spheres, but I just found these interesting
papers that seem to agree with me <g>
That the spheres show the process of self organization
(evolution) in non-living systems....that creation itself
can be seen in those spheres...
Some excerpts from the papers...
A New Physics Theory of Life
Why does life exist?
Popular hypotheses credit a primordial soup, a bolt of lightning and a
colossal stroke of luck. But if a provocative new theory is correct,
luck may have little to do with it. Instead, according to the physicist
proposing the idea, the origin and subsequent evolution of life follow
from the fundamental laws of nature and “should be as unsurprising as
rocks rolling downhill.”
England’s theory is meant to underlie, rather than replace, Darwin’s
theory of evolution by natural selection, which provides a powerful
description of life at the level of genes and populations. “I am
certainly not saying that Darwinian ideas are wrong,” he explained. “On
the contrary, I am just saying that from the perspective of the physics,
you might call Darwinian evolution a special case of a more general
phenomenon.”
“He’s trying something radically different,” said Mara Prentiss, a
professor of physics at Harvard who is contemplating such an experiment
after learning about England’s work. “As an organizing lens, I think he
has a fabulous idea. Right or wrong, it’s going to be very much worth
the investigation.”
Self-Replicating Sphere Clusters: According to new research at Harvard,
coating the surfaces of microspheres can cause them to spontaneously
assemble into a chosen structure, such as a polytetrahedron (red), which
then triggers nearby spheres into forming an identical structure.
Scientists have already observed self-replication in nonliving systems.
According to new research led by Philip Marcus of the University of
California, Berkeley, and reported in Physical Review Letters in August,
vortices in turbulent fluids spontaneously replicate themselves by
drawing energy from shear in the surrounding fluid. And in a paper
appearing online this week in Proceedings of the National Academy of
Sciences, Michael Brenner, a professor of applied mathematics and
physics at Harvard, and his collaborators present theoretical models and
simulations of microstructures that self-replicate. These clusters of
specially coated microspheres dissipate energy by roping nearby spheres
into forming identical clusters. “This connects very much to what Jeremy
is saying,” Brenner said.
https://www.quantamagazine.org/20140122-a-new-physics-theory-of-life/
http://www.scientificamerican.com/article/a-new-physics-theory-of-life/
Compare the illustration in the link of self replicating spheres
to the pic from Mars below....
http://areo.info/mer/opportunity/183/tn/1P144428432EFF3370P2540L5M1_L2L5L5L7L7.jpg.html
Self-organized iron-oxide cementation geometry
as an indicator of paleo-flows
Widespread iron oxide precipitation from groundwater in fine-grained red
beds displays various patterns, including nodulation, banding and
scallops and fingers. Hematite nodules have been reported also from the
Meridiani Planum site on Mars and interpreted as evidence for the
ancient presence of water on the red planet. Here we show that such
patterns can autonomously emerge from a previously unrecognized Ostwald
ripening mechanism and they capture rich information regarding ancient
chemical and hydrologic environments.
Round nodules tend to develop under nearly stagnant hydrologic
conditions, while repetitive bands form in the presence of persistent
water flows. Since water circulation is a prerequisite for a sustainable
subsurface life, a Martian site with iron oxide precipitation bands, if
one were found, may offer a better chance for detecting extraterrestrial
biosignatures on Mars than would sites with nodules.
Other mechanisms have also been proposed to explain the iron oxide
patterning. For example, the formation of iron oxide nodules has been
attributed to microbial oxidation, which could be induced when an
Fe(II)-containing fluid is mixed with an oxidizing fluid10, 11. But how
this reaction becomes periodically localized in space remains
unexplained. In addition, the environment for red bed deposition and
diagenesis is generally poor in organic matter and microbial activity
may be limited12. Importantly, no existing theory can explain a
geometrical transition from one pattern to another, for example, from
nodulation to bandings or vice versa.
http://www.nature.com/srep/2015/150630/srep10792/full/srep10792.html
PREBIOTIC CHEMICAL EVOLUTION ON AN EARLY MARS: CONSEQUENCES & ARTIFACTS
OF “ORGANIC” WEATHER CYCLES IN THE NOACHIAN L
Introduction: This is a first attempt to build a
'universal' theory of life’s (potential) origin on a
warmer, wetter younger Mars. The universalities of
chemical physics provide intimate details of the
hydrology and weather cycles of Mars' past; offering
critical insight into whether life could have arisen on
Mars in the first place through the process of
chemical evolution. Requiring only liquid water and
simple amphiphiles local 'organic weather cycles'
inevitably form when the Rayleigh-Taylor instability
in water is metastabilized by simple organic
compounds. These lead to a complex set of mutually
transforming phase transitions fundamental to
Lerman's theory of chemical evolution [1–5] utilizing
the organizing properties of the air-water interface
and its microenvironments - bubbles, aerosols, and
droplets (Figure 1). Early Martian weather cycles
would thus provide functional support for an
independent "origin" of Martian li
Do Martian Blueberries have Pits? Consequences
& Artifacts of “Organic” Weather Cycles: One of
the more intriguing ideas coming from this work is
the possibility, even likelihood, that the Martian
blueberries discovered by Spirit and Opportunity are
nucleated around organic matter or otherwise
mediated by organic rich fluids. From their initial
discovery, Martian blueberries were linked to
terrestrial concretions as their most likely analog;
with the strong implication that they were similarly a
result of Martian sedimentary processes. If Martian
blueberries are concretion-like objects, then their
ubiquity suggests highly efficient formation
processes. On Earth, by far the most efficient of such
processes (for ooids to larger concretions of many
feet diameter) involve organic nucleation sites or
organic coatings of mineral cores accompanied by
intermittently agitated water. On Earth many of these
organic nucleation sites are of biogenic origin.
http://www.lpi.usra.edu/meetings/lpsc2006/pdf/1566.pdf
CHARACTERISTICS OF TERRESTRIAL FERRIC OXIDE CONCRETIONS AND
IMPLICATIONS FOR MARS
The discovery of hematite spherules on Mars has driven efforts
to better understand both terrestrial examples of ferric
oxide concretions and the competing mechanisms that produce
spheroidal geometries.
The integration of geologic and planetary sciences continues
to encourage new findings in the quest to understand the role
of water on Mars as well as the tantalizing possibility
that extraterrestrial life is associated with mineral
records of watery environments.
Concreation preservation in the ancient rock provides a
comparative model for the Mars examples that are similarly
embedded in host sediments.
Although decades ago concretions were viewed simply as geologic
‘‘curiosities,’’ it is now clear that the presence of concretions has
important implications for understanding groundwater movement and
chemistry, diagenesis, host rock properties, biogeochemical processes,
and iron cycling (precipitation and mobilization) through time.
The purpose of this article is to review current knowledge of ferric
oxide concretions and the implications for Mars and to discuss the
current gaps in our understanding.
This indicates
that concretions are less than 2900 years old (Bowen et al. 2008). These
absolute age constraints and the observed field conditions (i.e.,
softness of concretions) indicate that these hematite concretions are
actively forming in the modern acid saline environment and should
therefore contain records of the existing geochemical and
microbiological conditions. Diagenetic cements and evaporite minerals
can serve as tombs of biological materials that are commonly involved in
or simply trapped or preserved by rapid mineral precipitation processes
The existence of minerals that indicate
both acidic and extremely saline fluids on Mars has pointed to
inhospitable conditions, even if liquid water was once present (Tosca et
al. 2008b). Preservation of microfossils in oxidizing environments has
been considered dubious (Sumner 2004). However, examination of
fluids and sediments from terrestrial environments with hypersaline
(low–water activity), acidic, and oxidizing conditions, such as are
presumed to have existed in the ancient Meridiani environment, reveals
that even in these extreme conditions, microbiological communities
exist (Mormile et al. 2009) and can be preserved by rapidly
precipitating evaporates and iron oxides (Benison et al. 2008,
Fernandez-Remolar and Knoll 2008). If life existed in past aqueous
environments on Mars, biosignatures may be preserved within
authigenic mineral accumulations, such as hematite concretions.
http://sp.sepmonline.org/content/sepspecpub/sepsp102/1/SEC12.body.pdf
s