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John Kierein
2004-Mar-10, 10:33 AM
http://marsrovers.jpl.nasa.gov/gallery/all/2/p/065/2P132133878ESF1500P2534R3M1.HTML

Did Spirit make it? Especially the round thingy.

http://marsrovers.jpl.nasa.gov/gallery/all/2/m/065/2M132132632EFF1500P2958M2M1.HTML

My guess is that they pressed the imager with cover closed on the ground and that it's a compaction in the cold snow/sand

Narthex
2004-Mar-10, 11:02 AM
Do we have prior evidence of sand/dust neatly creeping up and
settling on such imprints? The sand on the lower half of it doesn't
look like it was dropped onto it to cover it, but instead looks like
it's been there in its smooth state for a while. The one half is
pretty immaculate, in comparison.

Amadeus
2004-Mar-10, 12:04 PM
Very interesting. I think it is a safe bet to say that it is raised and not an impression. I base this on the shadow in the top right hand corner of the second image. Looking closer at it I can see pitting in it.

Hoagland seen this yet?

"C.D of the Gods"
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[EDIT] Changed my mind. Looked at all the images and I can now tell it is and impression. The shadow in the top right hand corner must be off a part of spirt with the light comming from the bottom of the picture.

Still looks interesting thought but it's not a cover stone!

dummy
2004-Mar-10, 12:55 PM
I would say it looks more like an imprint. If you take that second one and flip it upside down, then look along the top left curve of the imprint, you can see small bumps in the shadow correspond with little rocks around the edge of the imprint.

You can see the same kind of imprints here (http://marsrovers.jpl.nasa.gov/gallery/all/2/m/043/2M130169495EFF0514P2943M2M1.HTML) and here (http://marsrovers.jpl.nasa.gov/gallery/all/2/m/054/2M131155068EFF1124P2953M2M1.HTML). It's practically the same sized circle with the same proportionally sized middle hole as those two, which were made by the Spectrometer.

PeteB
2004-Mar-10, 02:25 PM
dummy is right. It's the imprint of the Mossbauer sensor head. If the surface is a little uneven they sometimes only get a portion of it pressed in.
http://athena.cornell.edu/the_mission/ins_moss.html

Hamlet
2004-Mar-10, 02:44 PM
http://marsrovers.jpl.nasa.gov/gallery/all/2/p/065/2P132133878ESF1500P2534R3M1.HTML

Did Spirit make it? Especially the round thingy.

http://marsrovers.jpl.nasa.gov/gallery/all/2/m/065/2M132132632EFF1500P2958M2M1.HTML

My guess is that they pressed the imager with cover closed on the ground and that it's a compaction in the cold snow/sand

Kind of looks like a Wintergreen Livesaver. :D

Seriously, this is quite an interesting object. It would be great to know what the rest of the object looks like. I wonder if there is a way to use the RAT to clear away some of the soil?

Hamlet
2004-Mar-10, 02:45 PM
Ah! Should have read the rest of the read before replying. It does appear to be an imprint. Oh well.

Amadeus
2004-Mar-10, 03:36 PM
Ah! Should have read the rest of the read before replying. It does appear to be an imprint. Oh well.

Dont worry I made the same mistake of jumping to conclusions.

I does look like a stone hoop, it just isn't.
On the plus side we could have debunked this before hoagland got his hands on it!

mr. show
2004-Mar-10, 04:41 PM
http://uplink.space.com/attachments//672949-Toiletseat.jpg

It seems raised to me...

Nowhere Man
2004-Mar-10, 05:06 PM
Turn it upside down.

Fred

ToSeek
2004-Mar-10, 05:33 PM
It seems raised to me...

Note that the ground looks pitted rather than sandy/lumpy, which doesn't make much sense. As the previous poster said, look at the image upside down.

JohnOwens
2004-Mar-10, 07:17 PM
I think this is indicative of a general problem when looking at many such surface pictures, and even some of the ones from orbit: we expect sunlight to be coming from above in a picture, because that's the way it usually is in horizontal pictures. When we get overhead pictures like these, if the light seems to be coming from the "wrong" direction, it throws us off unless there's an object with a shadow obviously in a certain direction (flagpole sticking up, or something like that). I think this would explain a lot of the "glass worms" confusion, and crater/dome mixup, as well.

Afterthought: This may be even truer on a computer monitor than on a hardcopy, since the vertical plane will convey the "this end up" impression where light should be coming from above, while a printout could be held flat, which might be perceived differently.

badactor
2004-Mar-10, 11:27 PM
Interesting how easily the eye (and brain) can fool you. In the lower left corner you can also see where some of the "wall" has crumbled down on to the impression.

Anthrage
2004-Mar-11, 01:32 AM
Hmmm, this is quite the image. Impression or no, have there been or are there plans to take another image of this area?

frogesque
2004-Mar-11, 01:58 AM
OK! Now we have proof there is life on Mars!

It's a footprint of the Traffic Warden that's given Spirit a ticket!

Espritch
2004-Mar-11, 02:24 AM
The image below shows the same thing in a wider context. It is a lot clearer in the picture that it's an impression, not a raised surface. I was more curious about the rock below it that appears to have been unsettled. I assume the rover must have run over it or otherwise done something to disturb it.

http://marsrovers.jpl.nasa.gov/gallery/all/2/p/065/2P132133908ESF1500P2534R4M1.JPG