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Image captured by Phoenix Mars lander  (Source: NASA)
There have been numerous traces of possible water on Mars, but astronomers are still looking for definitive proof

Researchers believe they have found evidence of liquid salt water on the Red Planet of Mars, with the discovery thanks to the NASA's Phoenix Mars lander.

Several images captured by Phoenix show what appear to be water droplets located on one of the rover's landing struts, which now makes researchers believe there could be liquid water somewhere under the surface of the planet.

"A large number of independent physical and thermodynamical evidence shows that saline water may actually be common on Mars," according to University of Michigan professor Nilton Renno.  "Liquid water is an essential ingredient for life.  This discovery has important implications to many areas of planetary exploration, including the habitability of Mars."

Renno worded his report very carefully, explaining that the discovery has "important implications," but not outright saying it's proof of water liquid.

Although the temperature in the northern plains of Mars didn't go above minus 15 degrees Fahrenheit while the Phoenix was there for a six-month period in 2008, researchers still believe there could be pockets of water under the surface.  The presence of high amounts of salt may have caused the freezing temperature of water on Mars down to minus 90 degrees, which is about 120 degrees colder than Earth's 32 degree freezing temperature for water.

There are numerous spots on Mars that could be salty enough that it's unlikely they'll be able to freeze without the temperature dropping to minus 100 degrees or further, scientists said.

The report is still highly controversial, despite 22 different scientists signing onto the report -- NASA never brought up the discovery, seeing how the evidence may not be enough.

Each discovery of possible signs of liquid water or ice helps researchers hone in on locations space probes and satellites can examine during future missions.



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Strange phrasing for a 'science' article
By rtrski on 3/19/2009 12:20:55 PM , Rating: 2
quote:
The presence of high amounts of salt may have caused the freezing temperature of water on Mars down to minus 90 degrees, which is about 120 degrees colder than Earth's 32 degree freezing temperature for water.


Ignoring the slight syntax error and the undefined use of the Fahrenheit scale, this still makes no sense. The freezing temperature of "water" on Mars is exactly the same as it is on Earth, under the same relative pressure (say at extremely high altitudes). As is the freezing temperature of highly-saturated perchlorate-salt-laden water.

Why not just say the presence of a high saturation of dissolved salts may have permitted the water to remain in liquid phase despite the fact that the measured temperature at the time of the sighting was around -15 degrees (F)? Instead you sound like you're saying the vapor phase plot of H2O is somehow different on Mars than on Earth.




By foxtrot9 on 3/19/2009 12:52:11 PM , Rating: 1
Get a life


By tjr508 on 3/19/2009 10:59:42 PM , Rating: 2
Chloride saturation doesn't have to be high to keep -15oF water liquid at ZERO psia (American units, suck it SI people).


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