Bumps and holes in the Martian mid-latitudes
Click for full image.
Today’s cool image to the right, taken on January 6, 2021 by the high resolution camera on Mars Reconnaissance Orbiter (MRO) and cropped and reduced to post here, focuses on what appears to be a volcanic bulge on the southeastern edge of the great Tharsis Bulge, home to Mars’ biggest volcanoes.
The terrain gives the appearance of hard and rough lava field, ancient and significantly scoured with time. The bumps and mounds suggest nodules that remained as the surrounding softer material eroded away. The holes suggest impact craters, but their relatively few number suggest that this ground was laid down in more recent volcanic events after the late heavy bombardment that occurred in the early solar system about 4 billion years ago. Since it is thought that the big Martian volcanoes stopped being active about a billion years ago, this scenario seems to fit.
However, the terrain also has hints of possible glacial features, as seen in the large crater-like depression in the image’s center. Below is a zoom in to that crater to highlight the flowlike features in its southern interior.
At 45 degrees south latitude it would not be surprising if there were glacial features here. Moreover, some of the impacts in the wider photo above have some resemblance to high latitude northern lowland impacts that look like they smashed into an ice layer close to the surface, melting that ice and causing the crater to have a splattered look.
These features however might not be glacial. The evidence is too slim, and requires more data. In the southern hemisphere the southern half of this crater would be more exposed to sunlight, while its northern half would be more in shadow. We should therefore expect the glacial features to survive longer in the crater’s northern half, not its southern half. Still, if these features are glacial then they do suggest sublimation of that ice by sunlight.
Questions upon questions and mysteries upon mysteries. It can drive you crazy with a desire to get them answered and explained. At the same time, making up explanations based on limited knowledge is very dangerous. Such hypotheses almost always turn out wrong. We need more data to really explain what we see here.
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.
Today’s cool image to the right, taken on January 6, 2021 by the high resolution camera on Mars Reconnaissance Orbiter (MRO) and cropped and reduced to post here, focuses on what appears to be a volcanic bulge on the southeastern edge of the great Tharsis Bulge, home to Mars’ biggest volcanoes.
The terrain gives the appearance of hard and rough lava field, ancient and significantly scoured with time. The bumps and mounds suggest nodules that remained as the surrounding softer material eroded away. The holes suggest impact craters, but their relatively few number suggest that this ground was laid down in more recent volcanic events after the late heavy bombardment that occurred in the early solar system about 4 billion years ago. Since it is thought that the big Martian volcanoes stopped being active about a billion years ago, this scenario seems to fit.
However, the terrain also has hints of possible glacial features, as seen in the large crater-like depression in the image’s center. Below is a zoom in to that crater to highlight the flowlike features in its southern interior.
At 45 degrees south latitude it would not be surprising if there were glacial features here. Moreover, some of the impacts in the wider photo above have some resemblance to high latitude northern lowland impacts that look like they smashed into an ice layer close to the surface, melting that ice and causing the crater to have a splattered look.
These features however might not be glacial. The evidence is too slim, and requires more data. In the southern hemisphere the southern half of this crater would be more exposed to sunlight, while its northern half would be more in shadow. We should therefore expect the glacial features to survive longer in the crater’s northern half, not its southern half. Still, if these features are glacial then they do suggest sublimation of that ice by sunlight.
Questions upon questions and mysteries upon mysteries. It can drive you crazy with a desire to get them answered and explained. At the same time, making up explanations based on limited knowledge is very dangerous. Such hypotheses almost always turn out wrong. We need more data to really explain what we see here.
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
making up explanations based on limited knowledge is very dangerous. Such hypotheses almost always turn out wrong. We need more data to really explain what we see here.
What a refreshing attitude – not to mention a realistic one.