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http://www.itwire.com/content/view/18901/1066/
This just popped up. I guess more news services will have it shortly.
This just popped up. I guess more news services will have it shortly.
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Gokul43201 said:A bunch of white stuff that was seen at the bottom of a pit had disappeared 4 days later? How much more clear evidence do we need? What else can explain this but the existence of Martians?
Big deal. Scotch on the rocks, now THAT would be reason to colonize.B. Elliott said:What would be a good find, is if we discovered water ice.
waht said:Phoenix lander is equipped with a mass spectrometer, and all sorts of instruments. It seems sort of premature to call that white stuff "ice" solely on relying on photographs as evidence, rather than other scientific instruments.
edward said:Have they given a surface termperature range?? Does the sun shine on the area and for how long ect.??
B. Elliott said:The sun shines constantly...
B. Elliott said:The sun shines constantly, but since it's in the process of dipping down past the horizon permanently during the winter season, the sunlight intensity is low. The temperature has been varying from about -30C to -80C. I haven't paid attention to pressure readings though. I also haven't heard of any speculation of what the ice may be, given the current data at hand.
rewebster said:I still think it's dry ice.
I'm thinking that "On Earth, as it is in the... (ooops) on Mars"---
Even in the summer, there's ice frozen a little ways under the ground near the Earth's poles (tundra)--on Mars it would be a 'dry ice' tundra----it's 'summer' where they are near the Mars 'pole'---so, I think it's 'dry ice tundra'.
Ivan Seeking said:It is believed that the Martian summers are too warm for it to be CO2.
Ivan Seeking said:It is believed that the Martian summers are too warm for it to be CO2.
http://www.space.com/scienceastronomy/060816_mars_icecaps.htmlPeculiar spots, fan-like markings, and spider-shaped features on Mars' southern ice cap are seasonal formations, researchers announced today.
The shapes [see Images] are formed by thin layers of dark dusty material that are sprayed by roaring jets of carbon dioxide that erupt through the ice cap.
This dusty material may also be the reason that the southern ice cap doesn't reflect much light.
edward said:Thanks for the information. Previous to the press release researchers at the U of A had noted the disappearance of the lumps in the lower left hand side of the pictures.
Someone there must have a sense of humor they have been giving things some pretty weird names. They referred to the lumps as "Dodo-Goldilocks"
http://phoenix.lpl.arizona.edu/
http://phoenix.lpl.arizona.edu/06_20_pr.phpThe key new evidence is that chunks of bright material exposed by digging on June 15 and still present on June 16 had vaporized by June 19. "This tells us we've got water ice within reach of the arm, which means we can continue this investigation with the tools we brought with us," said Mark Lemmon of Texas A&M University, College Station, lead scientist for Phoenix's Surface Stereo Imager camera. He said the disappearing chunks could not have been carbon-dioxide ice at the local temperatures because that material would not have been stable for even one day as a solid.
http://phoenix.lpl.arizona.edu/05_27_pr.phpthe average pressure was 8.55 millibars
B. Elliott said:Strange. Google says 855 pascals = 0.00843819393 atmospheres. So, going by that last chart, there shouldn't be any solid CO2 at all in the area? In fact the pressure is waaay off from being close. I'm guessing exposed CO2 would evaporate immediately?
rewebster said:"minimum of -140 °C"dry ice stays in a cooler for quite a while (on Earth)--maybe it stays longer below Earth (Mars earth/dirt, that is)
B. Elliott said:True, but I'm wondering how the temperatures vary across the surface as a whole; latitudinal night/day differences along with with varying elevations (pressures/temps). While also taking into consideration the difference between temperature and heat... heating effects by the sun during the daytime.
So much to consider!
rewebster said:yeah--but those are ave. temps----you'd have to know the temp and pressure (and the atmospheric concentration of co2) where the thing landed (and the temp of the ground a couple inches down)
rewebster said:I think there is water on Mars, but I still don't think those white chunks were (are) water. You know what would really be funny (funny in the way of the discovery) would be that all those 'water' features (the valleys, dry river beds, etc.) were caused by liquid CO2 instead of liquid water. If all the circumstances were just right (like on Earth for the glaciers to create those 'U' shaped valleys, all those river beds on Mars could have been created by liquid CO2.