Comments and questions about the
APOD on the main view screen.
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John Severinghaus
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by John Severinghaus » Mon Jan 26, 2015 5:58 am
Today's APOD about tall stone columns called Sever Strong Men.. suggests the tufa columns in Mono Lake California, formed under water when a spring of limestone loaded water comes from the ground into a very alkaline lake.
Was this area ever under an alkaline lake like the tufa?
jwseps@comcast.net
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Markus Schwarz
- Science Officer
- Posts: 228
- Joined: Wed Apr 29, 2009 11:55 am
- Location: Germany
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by Markus Schwarz » Mon Jan 26, 2015 8:04 am
This APOD looks like a scene right out of a science fiction movie. Great image!
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David J Wilson
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by David J Wilson » Mon Jan 26, 2015 10:13 am
High above, millions of stars shine down ....
I don't think so.
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Ann
- 4725 Å
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- Joined: Sat May 29, 2010 5:33 am
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by Ann » Mon Jan 26, 2015 11:41 am
David J Wilson wrote: High above, millions of stars shine down ....
I don't think so.
Oh sure. You just can't see millions of them with your naked eye.
Ann
Color Commentator
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Boomer12k
- :---[===] *
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by Boomer12k » Mon Jan 26, 2015 12:50 pm
Fascinating...and kudos to the intrepid photographer...
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Boomer12k
- :---[===] *
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by Boomer12k » Mon Jan 26, 2015 12:56 pm
John Severinghaus wrote:Today's APOD about tall stone columns called Sever Strong Men.. suggests the tufa columns in Mono Lake California, formed under water when a spring of limestone loaded water comes from the ground into a very alkaline lake.
Was this area ever under an alkaline lake like the tufa?
jwseps@comcast.net
Wikipedia says they were formed by weathering conditions...ice and wind...
After watching the video under "Rough Terrain" in the description....it was not in or near a lake...
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Last edited by
Boomer12k on Mon Jan 26, 2015 3:37 pm, edited 1 time in total.
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geckzilla
- Ocular Digitator
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- Joined: Wed Sep 12, 2007 12:42 pm
- Location: Modesto, CA
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Contact:
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by geckzilla » Mon Jan 26, 2015 4:26 pm
Ann wrote:David J Wilson wrote: High above, millions of stars shine down ....
I don't think so.
Oh sure. You just can't see millions of them with your naked eye.
Ann
See them, yes. Distinguish each individual? No. Photons from each star must be arriving at one's retina in order to see the Milky Way. Same with Andromeda. I suppose we can see billions of stars in the same way we can see trillions of atoms in the objects around us. Can I see any atoms? Hmm.
Just call me "geck" because "zilla" is like a last name.
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nigel
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by nigel » Mon Jan 26, 2015 6:48 pm
John Severinghaus wrote:Today's APOD about tall stone columns called Sever Strong Men.. suggests the tufa columns in Mono Lake California, formed under water when a spring of limestone loaded water comes from the ground into a very alkaline lake.
Was this area ever under an alkaline lake like the tufa?
jwseps@comcast.net
No, apparently these are the product of differential erosion of schist (a metamorphic rock).
http://www.rgo.ru/en/photo/manpupuner-rock-formations
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hoohaw
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by hoohaw » Mon Jan 26, 2015 10:05 pm
Oh, heck, I WILL complain, that big thing, whatever it is, is blocking my view of Cygnus!
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Ron-Astro Pharmacist
- Resistored Fizzacist
- Posts: 889
- Joined: Thu Jan 03, 2013 10:34 pm
- AKA: Fred
- Location: Idaho USA
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by Ron-Astro Pharmacist » Mon Jan 26, 2015 11:05 pm
nigel wrote:John Severinghaus wrote:Today's APOD about tall stone columns called Sever Strong Men.. suggests the tufa columns in Mono Lake California, formed under water when a spring of limestone loaded water comes from the ground into a very alkaline lake.
Was this area ever under an alkaline lake like the tufa?
jwseps@comcast.net
No, apparently these are the product of differential erosion of schist (a metamorphic rock).
http://www.rgo.ru/en/photo/manpupuner-rock-formations
Then these may be AKA : The Seven Schisters
![Laughing :lol2:](./images/smilies/asterisk_laugh.gif)
Make Mars not Wars
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Ann
- 4725 Å
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by Ann » Tue Jan 27, 2015 3:11 am
Ron-Astro Pharmacist wrote:
Then these may be AKA : The Seven Schisters
![Laughing :lol2:](./images/smilies/asterisk_laugh.gif)
Ann
Color Commentator
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Fred the Cat
- Theoretic Apothekitty
- Posts: 975
- Joined: Mon Feb 22, 2016 4:09 pm
- AKA: Ron
- Location: Eagle, Idaho
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by Fred the Cat » Sat Nov 28, 2020 6:19 pm
The journey to Manpupuner was fraught with difficulty. Being there had previously proven perilous and sparked mysteries yet
unraveled.
![scared :ohno:](./images/smilies/ohno.gif)
As with many APOD's - you have to admire the difficulties encountered to capture an image!
![clapping :clap:](./images/smilies/asterisk_clap.gif)
Freddy's Felicity "Only ascertain as a cat box survivor"
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neufer
- Vacationer at Tralfamadore
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- Location: Alexandria, Virginia
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by neufer » Sat Nov 28, 2020 6:42 pm
Ron-Astro Pharmacist wrote: ↑Mon Jan 26, 2015 11:05 pm
nigel wrote:John Severinghaus wrote:
Today's APOD about tall stone columns called Sever Strong Men.. suggests the tufa columns in Mono Lake California, formed under water when a spring of limestone loaded water comes from the ground into a very alkaline lake.
Was this area ever under an alkaline lake like the tufa?
No, apparently these are the product of differential erosion of schist (a metamorphic rock).
http://www.rgo.ru/en/photo/manpupuner-rock-formations
Then these may be AKA : The Seven Schisters
https://en.wikipedia.org/wiki/Schist wrote:
<<During metamorphism, rocks which were originally sedimentary, igneous or metamorphic are converted into schists and gneisses. If the composition of the rocks was originally similar, they may be very difficult to distinguish from one another if the metamorphism has been great. A quartz-porphyry, for example, and a fine grained feldspathic sandstone, may both be converted into a grey or pink mica-schist. Usually, however, it is possible to distinguish between sedimentary and igneous schists and gneisses. If, for example, the whole district occupied by these rocks has traces of bedding, clastic structure, or unconformability, then it may be a sign that the original rock was sedimentary. In other cases intrusive junctions, chilled edges, contact alteration or porphyritic structure may prove that in its original condition a metamorphic gneiss was an igneous rock. The last appeal is often to the chemistry, for there are certain rock types which occur only as sediments, while others are found only among igneous masses, and however advanced the metamorphism may be, it rarely modifies the chemical composition of the mass very greatly. Such rocks as limestones, dolomites, quartzites, and aluminous shales have very definite chemical characteristics that distinguish them even when completely recrystallized.>>
And schisters are not gneiss.
Art Neuendorffer