A pimple on Mars
Click for original image.
Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on November 1, 2024 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Labeled simply as a “terrain sample,” it was likely not taken as part of any specific research project, but to fill a gap in the camera’s schedule in order to maintain its proper temperature. When the camera team does this they try to pick something interesting, and sometimes succeed.
I think they succeeded in this case. At first glance this appears to be a crater, but on closer inspection it is instead a small mound. The picture was taken in the winter, at the high latitude of 55 degrees north. The featureless white surface surrounding this dark mound is almost certainly the mantle of dry ice that falls as snow and covers the poles during the winter. If not that, it is then likely to be a water ice sheet that orbital data suggests covers much of Mars’ high latitudes.
The white dot on the overview map to the right marks the location, deep within the northern lowland plains.
The white streaks that resemble cracks on the surface of the mound very likely are tracks created by that mantle of dry ice as it sublimates each spring back into gas. The sun shines through the clear dry ice, heats it at its base. The trapped gas flows along pathways (the white streaks) to find the weak point in the mantle, where the pressures causes it to break, allowing the gas to escape. In the southern hemisphere the ground is stable enough that these flow routes repeat from year to year and become very distinct. In the northern hemisphere the ground is usually not that stable, and thus the flow usually finds different routes from year to year.
This mound however appears more stable, and so the gas flows each year have deepened the cracks and made them stand out.
That is my theory based on what little I know of Martian geology. It is possible that I am completely wrong, and this mound and the white streaks are caused from an entirely different process.
Readers!
My annual February birthday fund-raising drive for Behind the Black is now over. Thank you to everyone who donated or subscribed. While not a record-setter, the donations were more than sufficient and slightly above average.
As I have said many times before, I can’t express what it means to me to get such support, especially as no one is required to pay anything to read my work. Thank you all again!
For those readers who like my work here at Behind the Black and haven't contributed so far, please consider donating or subscribing. My analysis of space, politics, and culture, taken from the perspective of an historian, is almost always on the money and ahead of the game. For example, in 2020 I correctly predicted that the COVID panic was unnecessary, that the virus was apparently simply a variation of the flu, that masks were not simply pointless but if worn incorrectly were a health threat, that the lockdowns were a disaster and did nothing to stop the spread of COVID. Every one of those 2020 conclusions has turned out right.
Your help allows me to do this kind of intelligent analysis. I take no advertising or sponsors, so my reporting isn't influenced by donations by established space or drug companies. Instead, I rely entirely on donations and subscriptions from my readers, which gives me the freedom to write what I think, unencumbered by outside influences.
You can support me either by giving a one-time contribution or a regular subscription. There are four ways of doing so:
1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.
2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
3. A Paypal Donation or subscription:
4. Donate by check, payable to Robert Zimmerman and mailed to
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Click for original image.
Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on November 1, 2024 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Labeled simply as a “terrain sample,” it was likely not taken as part of any specific research project, but to fill a gap in the camera’s schedule in order to maintain its proper temperature. When the camera team does this they try to pick something interesting, and sometimes succeed.
I think they succeeded in this case. At first glance this appears to be a crater, but on closer inspection it is instead a small mound. The picture was taken in the winter, at the high latitude of 55 degrees north. The featureless white surface surrounding this dark mound is almost certainly the mantle of dry ice that falls as snow and covers the poles during the winter. If not that, it is then likely to be a water ice sheet that orbital data suggests covers much of Mars’ high latitudes.
The white dot on the overview map to the right marks the location, deep within the northern lowland plains.
The white streaks that resemble cracks on the surface of the mound very likely are tracks created by that mantle of dry ice as it sublimates each spring back into gas. The sun shines through the clear dry ice, heats it at its base. The trapped gas flows along pathways (the white streaks) to find the weak point in the mantle, where the pressures causes it to break, allowing the gas to escape. In the southern hemisphere the ground is stable enough that these flow routes repeat from year to year and become very distinct. In the northern hemisphere the ground is usually not that stable, and thus the flow usually finds different routes from year to year.
This mound however appears more stable, and so the gas flows each year have deepened the cracks and made them stand out.
That is my theory based on what little I know of Martian geology. It is possible that I am completely wrong, and this mound and the white streaks are caused from an entirely different process.
Readers!
My annual February birthday fund-raising drive for Behind the Black is now over. Thank you to everyone who donated or subscribed. While not a record-setter, the donations were more than sufficient and slightly above average.
As I have said many times before, I can’t express what it means to me to get such support, especially as no one is required to pay anything to read my work. Thank you all again!
For those readers who like my work here at Behind the Black and haven't contributed so far, please consider donating or subscribing. My analysis of space, politics, and culture, taken from the perspective of an historian, is almost always on the money and ahead of the game. For example, in 2020 I correctly predicted that the COVID panic was unnecessary, that the virus was apparently simply a variation of the flu, that masks were not simply pointless but if worn incorrectly were a health threat, that the lockdowns were a disaster and did nothing to stop the spread of COVID. Every one of those 2020 conclusions has turned out right.
Your help allows me to do this kind of intelligent analysis. I take no advertising or sponsors, so my reporting isn't influenced by donations by established space or drug companies. Instead, I rely entirely on donations and subscriptions from my readers, which gives me the freedom to write what I think, unencumbered by outside influences.
You can support me either by giving a one-time contribution or a regular subscription. There are four ways of doing so:
1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.
2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
3. A Paypal Donation or subscription:
4. Donate by check, payable to Robert Zimmerman and mailed to
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652
You can also support me by buying one of my books, as noted in the boxes interspersed throughout the webpage or shown in the menu above.
Robert,
I suspect that if we look at it from far enough away, we would call it a beauty mark on Mars.