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Originally posted by ZikhaN
That's pretty interesting. That "hole" looks very suspicious too. Wonder what it really is..
[edit on 25-5-2007 by ZikhaN]
As we neared the dark, truncated cone the vessel's speed was diminished until we barely moved. Then we topped the crest of the mountain and below us I saw yawning the mouth of a huge circular well, the bottom of which was lost in inky blackness.
The diameter of this enormous pit was fully a thousand feet. The walls were smooth and appeared to be composed of a black, basaltic rock.
Originally posted by blue bird
What is this???
Originally posted by ArMaP
This week I have been reading "The gods of Mars", from Edgar Rice Burroughs
Originally posted by blue bird
And on the smaller one - it is visible a some kind of elevated rim triangle structure - with another smaller hole
Originally posted by DuncanIdahoGholem
So thats where th ocean went, somebody pulled out the plug!
Originally posted by ArMaP
Just a coincidence... I think
Originally posted by zorgon
Oops sorry forgot the original
barsoom.msss.com...
The structure in the right side one literally looks like it is descending as the perspective changes I would love to see a HiRISE of this one
Then the microscopic imager spotted something else. The rocks were riddled with tiny holes about a centimetre long. Geologists call them vughs. They form when long crystals grow inside rocks sitting in briny water, forcing open little cracks. When water dissolves the crystals all that remains are the holes.
Another camera snapped tantalising pictures of a layered rock. Some layers seemed to run in different directions, a pattern called cross-bedding. "Preliminary views by Opportunity," said NASA, "hint the cross-bedding bears hallmarks of water action ... [possibly] patterns formed by sinuous crestlines of underwater ridges."
Originally posted by ArMaP
In what state, solid or liquid? Solid is not very promising...
On Mars the globally-averaged surface pressure of the planet's atmosphere is only slightly less
than 6.1 millibars.
"That's the average," says Haberle, "so some places will have pressures that are higher than 6.1
millibars and others will be lower. If we look at sites on Mars where the pressure is a bit higher, that's
where water can theoretically exist as a liquid."
science.msfc.nasa.gov...
Furthermore, he says winds should spread water vapour through the atmosphere too quickly for it to be concentrated in certain spots. "It would take a tremendous source of water in the surface to pump water into the atmosphere faster than it would be redistributed," he says.
Krasnopolsky, standing by his methane detection, says winds should spread the trace amounts of methane around too. He believes the methane he detected is produced by bacteria that live in "oases" where liquid water can exist - however briefly - on the Martian surface, due to heating by sunlight or by a hydrothermal source.
He argues that a non-biological source of methane is unlikely because crater-counting methods suggest no surface lava on Mars is younger than 10 million years old.
But he will not rule out the possibility that underground bubbles of methane from ancient volcanism might somehow be brought to the surface to replenish the atmosphere.
www.newscientist.com...
PFS observed that, at 10-15 kilometers above the surface, water vapour is well mixed and uniform in the atmosphere. However, it found that, close to the surface, water vapor is more concentrated in three broad equatorial regions: Arabia Terra, Elysium Planum and Arcadia-Memnonia.
Here, the concentration is two to three times higher than in other regions observed. These areas of water vapor concentration also correspond to the areas where NASA's Odyssey spacecraft has observed a water ice layer a few tens of centimeters below the surface, as Dr Vittorio Formisano, PFS principal investigator, reports.
New in-depth analysis of PFS data also confirms that methane is not uniform in the atmosphere, but concentrated in some areas. The PFS team observed that the areas of highest concentration of methane overlap with the areas where water vapor and underground water ice are also concentrated. This spatial correlation between water vapor and methane seems to point to a common underground source.
www.astrobio.net...
Or kill it.
So, does that mean that Mars has only a South magnetic pole and not a North magnetic pole? Or are both magnetic poles at the South pole?
For a long time it was thought that Mars, like Venus, had no magnetosphere. The Russians first made measurements which suggested that there was a magnetic field present.
Scientists confirmed the existence of a magnetic field surrounding Mars using the magnetometer aboard the Mars Surveyor probe. The magnetic field was found on September 15, 1997, just 4 days after Surveyor plunged into Martian orbit.
Mars Global Surveyor's magnetometer discovered the outermost boundary of the Martian magnetic field -- known as the bow shock. The polarity of the magnetic field seems to be similar to that of Earth, though the field strength is only 1/800 the strength of the Earth's magnetic field.
All previous Martian missions had left inconclusive evidence regarding the presence of a magnetic field. Now we can be sure that Mars has a magnetosphere!
www.windows.ucar.edu...=/cool_stuff/tour_magnet_2.html&edu=high
Well, I haven't seen any water on Mars photos, only signs left by some liquid material that I do not have way of knowing if it was water.
"The three papers provide an overwhelming case for new thinking about recent geological activity on Mars," writes Baker in an analysis of the work.
Cataclysmic flooding
Baker said the findings support a 1991 hypothesis, then considered outrageous, that Mars has experienced episodes of cataclysmic flooding in modern times. Water is thought to have formed temporary seas, but researchers had long assumed it all evaporated into the thin Martian air.
Many scientists now agree that much of the water remained.
www.space.com...
Abstract
Streamlined forms and longitudinal grooving seen in Mars Orbital Camera (MOC) images indicate recent aqueous flooding occurred downslope (south) of the southern-most Cerberus Fossae fissure. Topography from the Mars Orbital Laser Altimeter (MOLA), in conjunction with the absence of fluvial features in MOC images immediately to the north of the Fossa, substantiate the idea that floods emanated from this fissure. The floodwater flowed southward onto the western Cerberus Plains, where it probably percolated into existing lava flows. Thus, shallow ice may still be extant beneath young lava flows in this equatorial region.
www.agu.org...
Rumors about what has been actually identified are about as fluid as liquid itself, from water-ice deposits, concentrations of iron, to Martian springs, and even Old Faithful-like geysers.
www.space.com...
SPACE.com has learned that NASA has discovered evidence of water on the Red Planets surface. The finding, made bythe Mars Global Surveyor spacecraft, fuels hopes that there may be life onMars.
Sources close to theagencys Mars program said the discovery involves evidence of seasonal deposits that could be associated with springs on the planets surface
NASA announces discovery of evidence of water on Mars
"We now know pretty convincingly that there is liquid water on Mars, and that it's relatively accessible near the surface," he said.
The field of space studies is known to throw curveballs. For instance, scientists last week said the latest evidence of water was found in cooler and darker areas facing away from the equator, while many had previously assumed that liquid water near the surface could only exist in hotter, sun-facing areas.
The discovery of evidence of liquid water on Mars boosts astrobiology.
OK, so what is the difference in temperature between near the South pole (around 80º, for example) during the South hemisphere's Summer and a place around 45º North during the North hemisphere Summer?
Originally posted by StellarX
And what other evidence do we have for pools of standing water?
Cross-lamination patterns in a rock called
"Last Chance" required flowing water at
Mars' surface, according to the Mars
Exploration Rover team. Inset: Black lines
trace cross-laminations, in magnified
images taken by Opportunity (at yellow
arrows). Blue lines show boundaries
where deposition may have halted between
crossbedded sets. Red arrows indicate
other possible crossbedding in the rock.