When we look up at a star filled night sky, the inevitable question turns to life beyond Earth. Whether you consider creation or evolution, the question is still asked. This post is principally for Old NFO and his Sci Fi story. I'm not sure that it's particularly useful, but you never know.
New work from a team including Carnegie’s Christopher Glein has revealed the pH of water spewing from a geyser-like plume on Saturn’s moon Enceladus. Their findings are an important step toward determining whether life could exist, or could have previously existed, on the sixth planet’s sixth-largest moon.
Enceladus is geologically active and thought to have a liquid water ocean beneath its icy surface. The hidden ocean is the presumed source of the plume of water vapor and ice that the Cassini spacecraft has observed venting from the moon’s south polar region. Whenever there’s the possibility of liquid water on another planetary body, scientists begin to ask whether or not it could support life.
A diagram illustrating the possible interior of Saturn's
moon Enceladus, including the ocean and plumes in
the south polar region, was based on Cassini
spacecraft, courtesy of NASA/JPL-Caltech.
The present team, including lead author Glein, John Baross of the University of Washington, and J. Hunter Waite Jr. of the Southwest Research Institute, developed a new chemical model based on mass spectrometry data of ice grains and gases in Enceladus’ plume gathered by Cassini, in order to determine the pH of Enceladus’ ocean. The pH tells us how acidic or basic the water is. It is a fundamental parameter to understanding geochemical processes occurring inside the moon that are considered important in determining Enceladus’ potential for acquiring and hosting life.
Christopher R. Glein, John A. Baross, J. Hunter Waite. The pH of Enceladus’ ocean. Geochimica et Cosmochimica Acta, 2015; DOI: 10.1016/j.gca.2015.04.017
The team’s model, constrained by observational data from two Cassini teams, including one led by coauthor Waite, shows that the plume, and by inference the ocean, is salty with an alkaline pH of about 11 or 12, which is similar to that of glass-cleaning solutions of ammonia. It contains the same sodium chloride (NaCl) salt as our oceans here on Earth. Its additional substantial sodium carbonate (Na2CO3) makes the ocean more similar to our planet’s soda lakes such as Mono Lake in California or Lake Magadi in Kenya. The scientists refer to it as a “soda ocean.”
The model suggests that the ocean’s high pH is caused by a metamorphic, underwater geochemical process called serpentinization. On Earth, serpentinization occurs when certain kinds of so-called “ultrabasic” or “ultramafic” rocks (low in silica and high in magnesium and iron) are brought up to the ocean floor from the upper mantle and chemically interact with the surrounding water molecules. Through this process, the ultrabasic rocks are converted into new minerals, including the mineral serpentine, after which the process is named, and the fluid becomes alkaline. On Enceladus, serpentinization would occur when ocean water circulates through a rocky core at the bottom of its ocean.
“Why is serpentinization of such great interest? Because the reaction between the metallic rocks and the ocean water also produces molecular hydrogen (H2), which provides a source of chemical energy that is essential for supporting a deep biosphere in the absence of sunlight inside moons and planets,” Glein said. “This process is central to the emerging science of astrobiology, because molecular hydrogen can both drive the formation of organic compounds like amino acids that may lead to the origin of life, and serve as food for microbial life such as methane-producing organisms. As such, serpentinization provides a link between geological processes and biological processes. The discovery of serpentinization makes Enceladus an even more promising candidate for a separate genesis of life.”
Even beyond the search for life-hosting conditions on other planetary bodies, the team’s work demonstrates that it is possible to determine the pH of an extraterrestrial ocean based on chemical data from a spacecraft flying through a plume.
To answer SOME of the daunting questions, we may have to wait for Old NFO's new science fiction book.
As of January 1, 2017 this blog began to receive anonymous posts. I try not to delete them, but if you want to be taken seriously here, you need to identify yourself, if only by some sort of cryptonym.
Welcome to Virtual Mirage
"But I don't want to go among mad people," Alice remarked.
"Oh, you can't help that," said the cat. "We're all mad here. I'm mad, you're mad."
"How do you know I'm mad," asked Alice?
"You must be," said the cat, "or you wouldn't have come here."
Virtual Mirage - What's on the other side of the mirror? Ask Alice how deep the rabbit hole really goes.
This blog is an extension of MY JOURNEY because sometimes my journey needs more explanation, and sometimes there is more to be said than can be expressed on one ordinary blog.
Sometimes it's politics (very serious), sometimes I address the human condition with a dose of humor, and other times it may seem as if the track is headed in a unique direction. I can be a complicated guy at times.
There are a few things you'll find I consider:
* Absence of proof is not proof of absence.
* Sometimes the questions are complex but the answers are simple.
* Love is the only condition where the happiness of another person is essential to your own.
* Steers do not sign treaties with meat packers. (think on that)
* Taxes are NEVER levied for the benefit of the taxed.
* The purpose of fighting is to win. There is no victory possible in defense.
WHITE POWDER (Novel)
There is something intoxicating about a secret.
THE OLD WHORE (NOVEL)
In the peculiar culture of the Central Intelligence Agency, "old whores" are people who will do whatever it takes to get the job done, irrespective of the cost.
EXILES FROM EDEN (NOVEL)
Sparks fly as two star-crossed lovers meet. He runs toward trouble as she yearns for something missing. And it ends in a flight from and toward justice.
Today, I balance work and play as much as anyone can. All things remaining equal, play is more important. Life is short - it's important to make every day count for something, if only to yourself.
I'm a former tinker/tailor/soldier/sailor who has now decided that maybe it really wasn't all done for nothing.
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