Sol 12 on onward general imaging, First TEGA delivery |
Sol 12 on onward general imaging, First TEGA delivery |
Jun 11 2008, 06:21 PM
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#106
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
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Jun 11 2008, 06:27 PM
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#107
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
They don't expect to find much ice in this first sample, but it probably sublimated away if it was there, since it's been sitting in the sunlight so long. In fact, one hypothesis is that it finally went through the screen because of this sublimation of water.
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Jun 11 2008, 06:29 PM
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#108
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
This place is dripping wet then ?
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Jun 11 2008, 06:32 PM
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#109
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
if... hypothesis...
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Jun 11 2008, 06:45 PM
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#110
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
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Jun 11 2008, 06:56 PM
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#111
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Senior Member Group: Members Posts: 2920 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
Ok it's an hypothesis but what could have led to sublimation? Can't be the vibrations I guess. Can it be because the screen warmed up the grains in contact? The whole sample warmed up because of Phoenix?
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Jun 11 2008, 07:02 PM
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#112
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
I think it's because exposed ice (to air and sun) sublimates faster than if it was, say, one inch deep under the surface. A couple of times Boynton and Smith even mentioned the possibility that it was liquid.
BTW, by calling (800)925-0173 one can listen to a replay of the whole teleconference over the phone. Pressing 7 skips back 30 seconds, 8 pauses, and 9 skips ahead 30 seconds. Hit 9 several times at the beginning to skip over the music. -------------------- |
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Jun 11 2008, 07:06 PM
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#113
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
If things are as they seem, then the structure at depth in this location consists of a dry surface where therefore ice does not persist and a deeper subsurface where it persists. It makes sense that if you raise material from below, you're going to move it from the location where it persists to a place where it doesn't.
In a bit more detail: The deeper you go subsurface, the more you weaken the seasonal and daily variations in temperature. You have permafrost where the annual temperature is below freezing AND deep enough for the cyclical temperatures to remain below freezing even at the maximum temperature. In contrast, you have a glacier where the maximum temperature is below freezing. (On Earth, you can even have glaciers where the maximum temperature is well above freezing, but that's because we have places where there is significant annual snowfall.) The Phoenix landing site has permafrost, but not a glacier (or permanent polar cap). So it makes sense that when you dig things up at this, the warmest time of the year, you'll be exposing ice to temperatures at which ice cannot remain frozen. |
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Jun 11 2008, 07:17 PM
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#114
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Member Group: Members Posts: 191 Joined: 20-November 06 From: Saint Louis Member No.: 1376 |
Don't have much to add from the notes I took during the briefing. But here are a few things:
In addition to calling the phone number listed above, the briefing will be archived and posted on JPL's website by this evening, and that's probably an easier way to listen. Next briefing will be televised, Friday at 2pm central. -------------------- - Matt
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Jun 11 2008, 07:20 PM
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#115
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
IIRC international callers are unable to access U.S. 800 numbers
-------------------- If Occam had heard my theory, things would be very different now.
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Jun 11 2008, 07:26 PM
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#116
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Member Group: Members Posts: 191 Joined: 20-November 06 From: Saint Louis Member No.: 1376 |
There is a number for international callers, but I don't know what it is. I'll see if I can find out if anyone wants it.
edit - No luck. I don't really know of too many places to look for it. It's mentioned at the end of the briefing, so once that's posted online you can hear it. But of course, if you're listening to the online version there's really no need for the number, so.... -------------------- - Matt
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Jun 11 2008, 07:38 PM
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#117
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
IIRC international callers are unable to access U.S. 800 numbers US/Canada can use the 800 number others can use (402)998-0031 One more thing to add from the teleconference: Dr. Bill Boynton said he found out that the oven was full about 1 hour before their "mid-point" status meeting where the moderator goes around the table asking the status of each instrument. He decided to keep it quiet until that meeting and just dropped it at the end of his status report, whereupon everyone erupted in cheers and a standing ovation, and Boynton played "Shake Shake Shake" which he had cued up on his laptop. One reporter asked: "were people dancing?" and Boynton replied: "*I* was." -------------------- |
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Jun 11 2008, 07:58 PM
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#118
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
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Jun 11 2008, 08:03 PM
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#119
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
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Jun 11 2008, 08:07 PM
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#120
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
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