Conscious Choice cover

From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.

 
Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.  
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.

 

“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of founder of the Mars Society.

 

Available everywhere for $3.99 (before discount) at Amazon, Barnes & Noble, and all ebook vendors, or direct from the ebook publisher, ebookit. And if you buy it from ebookit you don't support the big tech companies and I get a bigger cut much sooner.


A decade of changes at the Martian south pole

A decade of changes at the Martian south pole
Click for full image.

The image above, cropped, reduced, and annotated to post here, was released this week by the Mars Reconnaissance Orbiter (MRO) team. It shows the changes that have occurred at one location at the Martian south polar cap in the past decade. As planetary geologist Alfred McEwen wrote,

The south polar residual cap of carbon dioxide ice rapidly changes. This image was planned as an almost exact match to the illumination and viewing angles of a previous one we took in August 2009.

The pits have all expanded and merged, and we can just barely see the patterns in the 2009 image compared to this January 2019 picture. The 2009 image is also brighter and bluer, with more seasonal frost and/or less dust over the surface. These images were both taken in late southern summer, but our 2019 picture is slightly later in the Martian season by about two weeks.

You can get a better idea how much is changed by seeing the full image from which the above small area was cropped.

The 2009 image of the south cap
Click for original image.

The 2019 image of the south cap
Click for original image.

To the right is the 2009 image, reduced, rotated, and annotated by me. The red box indicates the small area covered by the above image. South is to the right. The many circular features probably indicate craters buried below the cap.

Below and to the right is the full 2019 image, rotated and cropped by me to match the 2009 image. The widespread differences are obvious. All of the white smooth areas have shrunk. New spots have appeared in those white areas, also suggesting the existence of buried craters.

The mystery here is that these images were both taken at almost the same moment in the late southern summer, though about five Martian years apart. Why should the white areas have shrunk? We would expect a reduction from winter to summer, but these were both taken in summer. While it would make sense to see changes, with some areas growing and others shrinking, we should expect to see about the same amount of white area.

Instead we see shrinkage only. Why? The only simple solution I can come up with that maybe these images simply don’t cover enough territory to provide us the full picture. The white areas, which are probably either frost or dry ice, have shrunk here, but grown in adjacent areas beyond this image.

Or maybe Mars has too many SUVs, and is now experiencing global warming! Yeah, that’s the answer! Nothing else make sense! The science is now settled. And if you disagree with me you must be a homophobic, white supremacist fascist, racist!

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One comment

  • danae

    The uniformity of the revealed freeze/thaw pattern is interesting. Geomorphologists must have a field day with NASA’s Mars photos. Some images you’ve shared have shown terrain beyond imagining.

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