The soft icy Martian northern lowland plains
Click for full image.
In a cool image post last week, I noted that the near surface “ice sheets in the northern lowland plains are never … smooth, even if well protected.” The picture to the right, cropped, reduced, and sharpened to post here, provides an excellent example. It was taken on November 2, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).
It is winter, and the sunlight is coming from the southwest, only 27 degrees above the horizon. The mound on the left is soft, while the depression on the upper right appears to have sand dune ripples sitting on top of a flat glacial mound. This depression may be an eroded crater (no upraised rim) or it could be a sink caused by the sublimation of the near surface ice.
Everywhere else the flat plains are stippled with small knobs.
The overview map below provides more context.
The yellow cross north of Erebus Montes marks this picture’s location. The numbered spots are images taken by MRO for SpaceX and are candidate landing sites for Starship. The four red dots are prime landing sites. The black dots are earlier MRO pictures taken when SpaceX was thinking of sending a Dragon capsule to Mars. The small global map on the right shows the area covered by this overview map.
This featureless but icy plain is about 150 miles northwest from the nearest prime Starship landing site (#2). This entire region is believed to have a lot of near surface ice, some so close to the surface the penetration by a hand shovel would reach it. The cool image above appears to reinforce that belief.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
Click for full image.
In a cool image post last week, I noted that the near surface “ice sheets in the northern lowland plains are never … smooth, even if well protected.” The picture to the right, cropped, reduced, and sharpened to post here, provides an excellent example. It was taken on November 2, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).
It is winter, and the sunlight is coming from the southwest, only 27 degrees above the horizon. The mound on the left is soft, while the depression on the upper right appears to have sand dune ripples sitting on top of a flat glacial mound. This depression may be an eroded crater (no upraised rim) or it could be a sink caused by the sublimation of the near surface ice.
Everywhere else the flat plains are stippled with small knobs.
The overview map below provides more context.
The yellow cross north of Erebus Montes marks this picture’s location. The numbered spots are images taken by MRO for SpaceX and are candidate landing sites for Starship. The four red dots are prime landing sites. The black dots are earlier MRO pictures taken when SpaceX was thinking of sending a Dragon capsule to Mars. The small global map on the right shows the area covered by this overview map.
This featureless but icy plain is about 150 miles northwest from the nearest prime Starship landing site (#2). This entire region is believed to have a lot of near surface ice, some so close to the surface the penetration by a hand shovel would reach it. The cool image above appears to reinforce that belief.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
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