1. Mick West

    Mick West Administrator Staff Member

    [​IMG]
    Source: http://mars.jpl.nasa.gov/mer/gallery/all/opportunity_m3720_text.html

    This image of a cross in a circle on the surface of Mars is real. It's from the Opportunity rover, Sol 3720. It's from the Microscopic Imager camera, so it's quite small.

    The most obvious clue is that it look like it's in soft sand. You can see cracks in the crumbling sand to the left of the cross, and there's a curve right next to it, that looks like something was pressed into the sand. So the obvious candidate for the source of the cross is the rover itself.

    And it turns out there is a very simple explanation. The x-ray spectrometer, seen here as it currently is on Mars:

    [​IMG]

    Here's a close up of a test version of the instrument.
    [​IMG]

    This is pressed against the rocks it is sampling to get the most accurate. Notice the screw heads are recessed. When this was pressed into the sand the cross came from the screw head, the circle came from the recess, and the curved line is from the inside curve of the instrument.

    [​IMG]

    The screws are a variety of distances from the inner curve:
    [​IMG]

    Here it is in action, pressed up against a rock:
    [​IMG]
     
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  2. Rico

    Rico Active Member

    I bow down to your god-like investigative skills.
     
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  3. Mick West

    Mick West Administrator Staff Member

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  4. David Coulter

    David Coulter Active Member

    Yes, there is now human presence on Mars. Heisenberg principle. That smiley face you will eventually see from an orbital imager might be rover tracks as an April Fools joke from a kid at JPL.

    But.... Having lived in Ireland for a while, the Celts could very well have colonized Mars with little difficulty, as long as a few barrels of Guinness were available.
     
    Last edited: Oct 23, 2014
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  5. Mick West

    Mick West Administrator Staff Member

    I though at first that the tracks might have screws in them, but they are perfectly smooth. Its quite obviously the spectrometer when you look at it. The amazing thing is that people will still believe it's something else.
     
  6. David Coulter

    David Coulter Active Member

    BTW, great work Mick. Your research into these things amazes me.
     
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  7. M Mahin

    M Mahin New Member

    You did not bother to check the NASA log page of the Opportunity rover. That log page shows that there was no use of the APXS in the period during which the Mars "Celtic Cross" photo was taken (July 9 to July 17th) -- a period during the rover was on the move -- until the night AFTER the photo was taken. The NASA log of Opportunity's activities refutes your hypothesis that the APXS was the cause of this "Celtic cross." See the blog post below for the details:

    http://www.futureandcosmos.blogspot.com/2014/10/why-celtic-cross-on-mars-cannot-be.html
     
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  8. Mick West

    Mick West Administrator Staff Member

    That's not a log. It's just a condensed description of events. It does not include everything that happened, just some events of interest. It does note that the the APSX was used on that day.

    http://www.nasa.gov/mission_pages/mer/opportunity-update.html#.VEnez5PF__A
     
    Last edited: Oct 23, 2014
  9. deirdre

    deirdre Moderator Staff Member

    I think this is the right screw head as if you look closely the lines DON'T exactly line up in the mars pic. or on the APXS screws. Pretty huge coincidence if this wasn't from a screw!

    http://projectavalon.net/forum4/sho...aph--Sol-3720-&p=888369&viewfull=1#post888369
     
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  10. ufoofinterest

    ufoofinterest Member

    Thank you very much Mick for your excellent analysis that confirms my tweet about this hoax:

     
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  11. Igrokush1

    Igrokush1 Member

    Well it's obvious there is a semi-circular imprint to the left of the imprint in question. And besides, are the people of NASA impervious to human log error by a few hours? I'm sure it's happened once or twice ...
     
  12. Alhazred The Sane

    Alhazred The Sane Senior Member

    Meh, Guinness is a relatively new thing. What we'd have needed was poteen.
     
  13. WeedWhacker

    WeedWhacker Senior Member

    What?
     
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  14. Mick West

    Mick West Administrator Staff Member

    He is referring to the order of events listed below. I think it's more likely that it simply does not list every single little movement of the arm.

    If they want to take a microscopic imaging mosaic in conjunction with and APSX scan, then it makes sense to first position the APSX agains the surface, and record that position for the camera. You then remove the APSX, position the camera to take photos using daylight, then reposition the APSX for the overnight scan.

    The bolded text is simply cut and paste every time they do a Microscopic imager in conjunction with APSX.

     
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  15. Mick West

    Mick West Administrator Staff Member

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  16. kimc

    kimc New Member

    I'm sorry Mike but even you measure all the "various" screws on the spectrometer, the ratios from the chamfer for the screw head to the housing inside radial curve impression in the sand do not work. This is an artificial object on Mars.
     
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  17. Mick West

    Mick West Administrator Staff Member

    Please explain what "does not work", provide your diagrams, measurements, and math.