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When Opportunity landed on Mars in January of 2004, the rover found an abundance of these spherules resting on the surface. They were nicknamed 'blueberries' by NASA scientists because of the bright blue color of their hematite shells. Hematite typically forms under watery conditions, so these 'blueberries' were listed as evidence of past liquid water on Mars' surface. However, scientists eventually concluded that they were more likely caused by volcanic activity or by meteoroid impacts. Adding to this, a recent study called into question a watery past for Mars by showing that large clay deposits found on Mars may be the result of volcanic activity, rather than deposition by water.
It's a question that has plagued scientists for decades: Is there, or has there ever been, life on Mars?
While the answer to that question has often swayed from a slight "maybe" to a definitive "no," the recent discovery of iron 'blueberries' -- small, spherical hematite balls -- by the NASA Opportunity Rover indicates that life may have existed on Mars millions of years ago.
These 'blueberries,' as they have been dubbed, were initially thought to provide evidence of water on Mars, according to LifeScientist. However, researchers from the University of Western Australia and the University of Nebraska found that similar iron-oxide spheres analyzed on Earth are formed by microorganisms. If the same holds true for Mars, the iron 'blueberries' could not have plausibly been created without the existence of microbes on Mars.
Martian spherules (also known as blueberries due to their blue hue in false-color images released by NASA) are the abundant spherical hematite inclusions discovered by the Mars rover Opportunity at Meridiani Planum on the planet Mars. They are found in situ embedded in a sulfate salt evaporitic matrix, and also loose on the surface.
The shapes by themselves don't reveal the particles' origin with certainty. "A number of straightforward geological processes can yield round shapes," said Dr. Hap McSween, an Opportunity science team member from the University of Tennessee, Knoxville. They include accretion under water, but apparent pores in the particles make alternative possibilities of meteor impacts or volcanic eruptions more likely origins, he said.
Mosaic shows some spherules partly embedded, spread over the (smaller) soil grains.
For example, ranging in size from less than 100 micrometers to more than 250 micrometers, similar spherules were found in Moon soil samples collected by Apollo 12 at the Procellarum Basin, and Apollo 14 near Mare Imbrium (Sea of Rains), the dark crater that dominates the Moon's face, and their properties were consistent with expectations for creation by meteor impacts.
Opportunity discovered spherules at its landing site more than eight-and-a-half years earlier. Those spherules were nicknamed "blueberries." They provided important evidence about long-ago wet environmental conditions on Mars because researchers using Opportunity's science instruments identified them as concretions rich in the mineral hematite deposited by water saturating the bedrock. A picture of the "blueberries" from the same Microscopic Imager is PIA05564
Spherical iron-oxide concretions - dubbed "blueberries" - were first found on the Red Planet in 2004 by an earlier NASA robotic probe - Opportunity Rover - providing some of the first evidence for liquid water on Mars.
Earth-based analogues for these "blueberries" are found in the Jurassic Navajo Sandstone near the Colorado River, Utah, where the concretions range in size from small marbles to cannonballs and consist of a hard shell of iron oxide surrounding a softer sandy interior.
Previous theories suggested these concretions were formed by simple chemical reactions without the help of life. However, new UWA research shows clear evidence that microbes were essential in their formation. This raises the possibility that Martian "blueberries" may not only reveal that water was present on Mars - but life too.
Originally posted by qmantoo
...Knowing what I now know(!) about the wind and the total lack of wind, and water erosion, it seems the only erosion worth much is radiation bombardment erosion. I did not really know how this affected the rocks, and whether this would be enough to release all these spherical concretions of iron oxide that we see scattered about the images...
I don't see any stalks in your examples but why not?
What is the stalk then ? On a planet without vegitation and without life, are we saying this 'stalk' is a piece of rock?
I don't see any stalks in your examples but why not?
In the first image, you dont see a stalk on the left hand side?
I saw it. As I said, I don't think it is attached to the spheroid. I do not think it is associated with the spheroid. I understand that your opinion is not the same as mine.
Dont just tell me you cannot see anything, now I have boxed it, if you cannot see a stalk, please tell me what this is then (highlighted in yellow box)?
I saw it. As I said, I don't think it is attached to the spheroid. I do not think it is associated with the spheroid. I understand that your opinion is not the same as mine.
You assume that the visible portion of the "stalk" is all that there is to it. There is nothing to base that assumption upon. The "stalk" may complete change shape beneath the dust. There may be portions of the "stalk" which are hidden by the spheroid.
Well I'm sure you know as much about Martian soil and rock chemistry and the formation of the spheroids as the the geologists at NASA but let's turn what you just said around.
Basically, there are some places which could have spherules produced by these things, but in order to have a valid explanation for them, (either a, b, or c ) there has to be evidence in each instance for them coming from any one of these places. I am not sure there is that evidence on Mars.
Originally posted by Phage
reply to post by qmantoo
Well I'm sure you know as much about Martian soil and rock chemistry and the formation of the spheroids as the the geologists at NASA but let's turn what you just said around.
Basically, there are some places which could have spherules produced by these things, but in order to have a valid explanation for them, (either a, b, or c ) there has to be evidence in each instance for them coming from any one of these places. I am not sure there is that evidence on Mars.
If the spheroids are of biological origin there has to be evidence other than "Well, they look like little mushrooms so surely they are."
Lets discuss why you do not think it is associated with the spherule.
I do not see any evidence that these spherules are concretions
Science says these blueberries are created by one of 3 things.
a) volcanic action
b) erosion on a rock where they have been encased,
c) meteors
There are many spherules in one place and not always a rock from which they were 'weathered'.
Has anyone described how these small 5mm spherules are produced by volcanic action?
Has anyone described how these small 5mm spherules are produced by meteors?
Understanding what the conditions are on the surface it is, if not out of the question, very nearly so. Do you understand how dry it is? Do you understand how cold it gets?
If you are a science type, then have an open mind for other possibilities. It is not out-of-the-question that these are fungi, is it?
How hard have you looked? How much do you know about what analysis has been done? Do you think that images are all that is used?
If science wants to tell us they have an answer for these things, then they have to give us as much proof for their hypothesis as we have to give them for our suggestions. Currently they are not.
But how can we confirm it with other things, especially on a microscopic scale, when all we have is an image, and evidence that minerals can form naturally in the same shape?