A Martian “glacier” made of volcanic ash
Click for full image.
Of the numerous cool images I’ve posted on Mars, many have documented the growing evidence that in the mid-latitudes of the Red Planet are many buried glaciers of ice.
Today’s cool image to the right, rotated, cropped and reduced to post here, shows something that at first might resemble the features one would expect from an ice glacier, but in reality is actually a flow of volcanic ash being blown almost like a river, with the prevailing winds blowing from the south to the north.
The photo was taken by the high resolution camera on Mars Reconnaissance Orbiter (MRO) on November 1, 2020. The location, very close to the equator and in the transition zone dubbed the Cerberus Plains, is also smack dab between Mars’s biggest volcanoes, a region I like to dub Mars’s volcano country. The overview map below gives the context.
The white cross indicates the photo’s location, right in the midst of the Medusae Fossae Formation, the largest volcanic ash deposit on Mars. This particular section of the Medusae ash deposit is located on a large uplifted region called Lucas Planum, a huge mound about 540 miles across and encompasses the eastern outlined section of the Medusae Fossae Formation where the white cross is placed.
I’ve posted a number of similar images showing the wind-blown erosion of the Medusae Fossae Formation (see for example here and here). The features all have a similar appearance, reminiscent of the carved mesas of the American southwest, but much softer and more sculpted. It is my impression that this is a region of softly piled sand and dust, easily dug but difficult to build on because the ground is weakly structured and so easily eroded. Imagine the difficulties of building a home on a beach.
Scientists today believe that much of the dust we find on Mars comes from the Medusae. What they don’t yet know is when it was created, from what volcano or volcanoes, and in how many different eruptions. To answer those questions will require in situ observations, including a gathering of many samples that all can be dated.
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 print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. 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.
Of the numerous cool images I’ve posted on Mars, many have documented the growing evidence that in the mid-latitudes of the Red Planet are many buried glaciers of ice.
Today’s cool image to the right, rotated, cropped and reduced to post here, shows something that at first might resemble the features one would expect from an ice glacier, but in reality is actually a flow of volcanic ash being blown almost like a river, with the prevailing winds blowing from the south to the north.
The photo was taken by the high resolution camera on Mars Reconnaissance Orbiter (MRO) on November 1, 2020. The location, very close to the equator and in the transition zone dubbed the Cerberus Plains, is also smack dab between Mars’s biggest volcanoes, a region I like to dub Mars’s volcano country. The overview map below gives the context.
The white cross indicates the photo’s location, right in the midst of the Medusae Fossae Formation, the largest volcanic ash deposit on Mars. This particular section of the Medusae ash deposit is located on a large uplifted region called Lucas Planum, a huge mound about 540 miles across and encompasses the eastern outlined section of the Medusae Fossae Formation where the white cross is placed.
I’ve posted a number of similar images showing the wind-blown erosion of the Medusae Fossae Formation (see for example here and here). The features all have a similar appearance, reminiscent of the carved mesas of the American southwest, but much softer and more sculpted. It is my impression that this is a region of softly piled sand and dust, easily dug but difficult to build on because the ground is weakly structured and so easily eroded. Imagine the difficulties of building a home on a beach.
Scientists today believe that much of the dust we find on Mars comes from the Medusae. What they don’t yet know is when it was created, from what volcano or volcanoes, and in how many different eruptions. To answer those questions will require in situ observations, including a gathering of many samples that all can be dated.
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 print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. 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
A geologist spending spending an afternoon on Mars could do the job of 1000+ rovers.