Pioneer cover

From the press release: From the moment he is handed a possibility of making the first alien contact, Saunders Maxwell decides he will do it, even if doing so takes him through hell and back.

 
Unfortunately, that is exactly where that journey takes him.

 
The vision that Zimmerman paints of vibrant human colonies on the Moon, Mars, the asteroids, and beyond, indomitably fighting the harsh lifeless environment of space to build new societies, captures perfectly the emerging space race we see today.


He also captures in Pioneer the heart of the human spirit, willing to push forward no matter the odds, no matter the cost. It is that spirit that will make the exploration of the heavens possible, forever, into the never-ending future.

 
Available everywhere for $3.99 (before discount) at amazon, Barnes & Noble, all ebook vendors, or direct from the ebook publisher, ebookit.
 

Two wedding cakes on Mars

Tall wedding cake on Mars
Click for full image.

It it time for two cool Martian images from the high resolution camera on Mars Reconnaissance Orbiter (MRO). Though both show features that are similar and likely had some comparable geological origins, they are located in two very different places on Mars and thus also had very different histories.

What makes them fun is how much both resemble classic tall wedding cakes, though the second has unfortunately fallen down and is no longer eatable.

The first, cropped on the right to post here, was taken on May 18, 2020, and is described by the science team as a “Tall Layered Mesa in Crater in Deuteronilus Mensae.” Deuteronilus Mensae is in the transition zone between the northern lowland plains and the southern cratered highlands, and being in the high mid-latitudes (42 degrees north) shows a lot of evidence of buried and eroded glaciers. Many of these glaciers are found inside craters.

What caused this layered mesa however to form is beyond me. It is taller than the crater in which it sits, as well as the surrounding terrain. A glacier would settle into the lowest regions, and would not last if exposed above the rim like this is. Its height suggests that the surrounding terrain was once much higher, and has been eroded away. Yet if so, why does this mesa also sit inside a depression?

The second “wedding cake” is even more intriguing, though less baffling.

Fallen wedding cake on Mars
Click for full image.

This image, taken on May 13, 2020, shows a section of layered terrain that appears to have separated from the cliff to the south and fallen over so that the layers are now tilted. This event must have occurred a long time ago, as enough erosion has occurred to soften that cliff. Moreover, in the full image we can see that the fallen section is located inside a large channel that has features suggestive of glacial flow that might have pushed that section away from the cliff over time.

This fallen “wedding cake” is also located in the mid-latitudes (37 degrees south), so to find glacial features here is likely. For example, look closely at the debris pushed up against that southern cliff. Looks like glacial debris to me.

The location however is within Hellas Basin, what I call the basement of Mars because it has the lowest elevation on the planet. Hellas has a lot of strange layered features, the origin of which are still being debated. Wind certainly played a part in forming these layers, but so could have either water or ice.

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2 comments

  • Jeff

    The first image is another of those my mind sees as reversed, at first. Initially it looks more like an amphitheater, with stepped layers down into the center. Once I clicked on the full image and saw more examples of sun angles, the “wedding cake” popped into view.

    Hmm, maybe it’s time for new glasses?…

    Really enjoy these “cool images”

  • pzatchok

    Looks like a mud volcano.

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