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Genesis cover

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. from any other book seller, or direct from my ebook publisher, ebookit. 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.


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"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


Scientists: Suspended iron minerals floating in Venus’s atmosphere explain dark UV streaks

Venus as seen in ultraviolet by Mariner 10, February 5, 1974
Venus as seen in ultraviolet by Mariner 10,
February 5, 1974

The uncertainty of science: Since the mid-1970s scientists have been trying to figure out the cause of the dark streaks seen in the atmosphere of Venus when photographed in ultraviolet. The image to the right was the first such UV image, taken by Mariner 10 during its fly-by on its way to Mercury. These streaks are caused by some unknown material that absorbs the UV light.

Researchers have now proposed that two different iron-bearing minerals, floating in Venus’s atmosphere, are what cause these dark UV streaks. From the absract:

Our results demonstrate that ferric iron can react with sulfuric acid to form two mineral phases: rhomboclase [(H5O2)Fe(SO4)2·3H2O] and acid ferric sulfate [(H3O)Fe(SO4)2]. A combination of these two mineral phases and dissolved Fe3+ in varying concentrations of sulfuric acid are shown to be good candidates for explaining the 200- to 300-nm and 300- to 500-nm features of the reported unknown UV absorber.

Iron has been detected in the atmosphere previously, and is theorized could come from volcanic eruptions on the planet’s million-plus volcanoes.

This new hypothesis explaining the dark UV absorber however remains unconfirmed, and joins a list of other candidates for that absorber, many of which propose either iron or sulfur in different combinations. Because so little data really exists about the atmosphere of Venus, with what is known also uncertain, it is presently impossible to solve this mystery with confidence. The problem is made even more difficult in that scientists understand almost nothing about the chemistry of materials under the conditions seen in Venus’s atmosphere, which is extremely hot (800 degrees Fahrenheit) and very thick and dense (100 times that of Earth).

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One comment

  • Doubting Thomas

    I wonder if you could atmospherically mine iron our of the Venusian clouds? I guess the concentration of sulfuric acid, high temperature and pressure all make it hard…but it is fun to think about.

    Always fascinated when I read where there are regions of Venusian sky that are above great mass of clouds and acid and have at least pressures that are “earth-like”. Wish I could live to see “The Cloud Cities of Venus”

    Cool stuff!

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