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Astronomy Picture of the Day -- Earth's Richat Structure
NASA ^ | May 19, 2013 | (see photo credit)

Posted on 05/19/2013 6:05:54 AM PDT by SunkenCiv

Explanation: What on Earth is that? The Richat Structure in the Sahara Desert of Mauritania is easily visible from space because it is nearly 50 kilometers across. Once thought to be an impact crater, the Richat Structure's flat middle and lack of shock-altered rock indicates otherwise. The possibility that the Richat Structure was formed by a volcanic eruption also seems improbable because of the lack of a dome of igneous or volcanic rock. Rather, the layered sedimentary rock of the Richat structure is now thought by many to have been caused by uplifted rock sculpted by erosion. The above image was captured by the ASTER instruments onboard the orbiting orbiting Terra satellite. Why the Richat Structure is nearly circular remains a mystery.

May 19, 2013

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; mauritania; science
[Credit: NASA/GSFC/METI/Japan Space Systems, and U.S./Japan ASTER Science Team]

1 posted on 05/19/2013 6:05:54 AM PDT by SunkenCiv
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To: thackney

Cool photo of a probable uplift dome.


2 posted on 05/19/2013 6:07:24 AM PDT by dirtboy
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To: SunkenCiv

It is, obviously, the remnants of a landing platform for alien spacecraft.

And I’ll be willing to bet that the Nazca Lines are EXACTLY on the opposite side of the planet (give or take a few 100 degrees of latitude and longitude< LOL)


3 posted on 05/19/2013 6:09:08 AM PDT by left that other site ((Ban the ubiquitous and deadly solvent, Di-hydrogen monoxide!!!))
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To: dirtboy

Probable related thread?

http://www.freerepublic.com/focus/f-chat/3021270/posts


4 posted on 05/19/2013 6:10:51 AM PDT by left that other site ((Ban the ubiquitous and deadly solvent, Di-hydrogen monoxide!!!))
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To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...

My wild guess on this is, the circular form is due to an impact, but the lack of shocked quartz and whatnot is due to the area having been covered by ice or water at the time of the impact. If there's no iridium enrichment, then the impactor was a comet. And I just now had breakfast, I work fast. ;')
The big version.



5 posted on 05/19/2013 6:13:01 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...
Not an impact crater? Not 'cryptovolcanism'? Erosional feature? But we don't know why it's round? I love a mystery. :')

6 posted on 05/19/2013 6:13:05 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: left that other site

http://whatscookingamerica.net/Eggs/FriedEgg3.jpg


7 posted on 05/19/2013 6:15:22 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: left that other site

http://randomstory.org/wp-content/uploads/2013/04/182.jpg


8 posted on 05/19/2013 6:15:46 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: left that other site

Clearly, there was a much earlier advanced civilization on Earth, and the Borg removed it from this spot.


9 posted on 05/19/2013 6:16:43 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv

Looks Good! :-)


10 posted on 05/19/2013 6:20:17 AM PDT by left that other site ((Ban the ubiquitous and deadly solvent, Di-hydrogen monoxide!!!))
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To: SunkenCiv

How long is a kilometer?


11 posted on 05/19/2013 6:35:48 AM PDT by BenLurkin (This is not a statement of fact. It is either opinion or satire; or both)
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To: BenLurkin

About 0.6 miles.


12 posted on 05/19/2013 6:38:12 AM PDT by katana (Just my opinions)
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To: BenLurkin

It’s 39,360 inches. :’)


13 posted on 05/19/2013 7:13:45 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv

The rest of us weren’t worthy of assimilation, hunh?


14 posted on 05/19/2013 7:17:55 AM PDT by mdmathis6 (Rest assured, Mankind is loved....both completely and severely!)
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To: BenLurkin

IOW, the crater is about 31 miles across.


15 posted on 05/19/2013 7:18:15 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: left that other site

“It is, obviously, the remnants of a landing platform for alien spacecraft.”
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Actually that’s where my great granpappy’s still blew up.


16 posted on 05/19/2013 7:22:02 AM PDT by RipSawyer (I was born on Earth, what planet is this?)
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To: SunkenCiv

Thank you, sir.


17 posted on 05/19/2013 7:23:17 AM PDT by BenLurkin (This is not a statement of fact. It is either opinion or satire; or both)
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To: SunkenCiv

It looks like a hurricane.


18 posted on 05/19/2013 7:42:42 AM PDT by MestaMachine
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To: SunkenCiv

Target Practice


19 posted on 05/19/2013 7:42:56 AM PDT by mikrofon (APOD Bump)
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To: SunkenCiv

Looks like an eye with milky cataracts.


20 posted on 05/19/2013 7:45:52 AM PDT by Yardstick
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To: mdmathis6

Hey, have you ever gotten a really good look at most of us? ;’)


21 posted on 05/19/2013 8:02:39 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv

Looks like the giant drain Africa has been circling...


22 posted on 05/19/2013 8:17:50 AM PDT by Moltke ("I am Dr. Sonderborg," he said, "and I don't want any nonsense.")
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To: SunkenCiv

Thank you for the one-click-instead-of-two to access the larger version of the image. That’s actually quite beautiful, and its miniature would make a lovely pendant.

Also, your opinions about its formation and composition make a lot of sense. I wonder why NASA didn’t figure that out?


23 posted on 05/19/2013 8:35:00 AM PDT by TheOldLady
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To: SunkenCiv

Looks like an ancient strip mine.


24 posted on 05/19/2013 9:23:02 AM PDT by rawcatslyentist (Jeremiah 50:32 "The arrogant one will stumble and fall With no one to raise him up; And I will set)
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To: dirtboy; All

could it be over a salt dome? Or a cold pluton?


25 posted on 05/19/2013 10:16:45 AM PDT by gleeaikin
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To: BenLurkin

3280.84 feet


26 posted on 05/19/2013 10:59:28 AM PDT by Mmogamer (I refudiate the lamestream media, leftists and their prevaricutions.)
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To: dirtboy
Interesting.


27 posted on 05/19/2013 5:17:24 PM PDT by thackney (life is fragile, handle with prayer)
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