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Did A Giant Impact Create The Two Faces Of Mars?
New Scientist ^ | 3-15-2007 | David Shiga

Posted on 03/15/2007 2:14:24 PM PDT by blam

Did a giant impact create the two faces of Mars?

16:29 15 March 2007
NewScientist.com news service
David Shiga, Houston

Mars's northern hemisphere is lower in elevation – by about 5 kilometres – than its southern hemisphere (see image below). This coloured topographical map shows low elevations in blue and high elevations in yellow and red. The map is centred on a latitude of 55° north (Illustration: Mike Caplinger/MSSS)

Mars's southern hemisphere is higher and more heavily cratered than the northern hemisphere, suggesting it is older terrain. The two low elevations (blue) in this map, which is centred on the southern mid-latitudes, are the impact basins Argyre and Hellas (Illustration: Mike Caplinger/MSSS) The impact of a giant asteroid could explain why Mars has two very different faces – but only if it struck the planet with a glancing blow, computer simulations suggest.

A longstanding puzzle about Mars is why its northern and southern hemispheres are so different. The northern hemisphere is much flatter and lies lower than the southern hemisphere, with a difference in elevation between the two of about 5 kilometres.

In the 1980s, scientists suggested a giant impact by an asteroid about 300 kilometres across in Mars's early history could have led to a permanent depression in the planet's northern hemisphere.

Now, two teams of scientists have created the first computer simulations testing whether such an impact could have produced the observed differences.

Shawn Hart of the University of California in Santa Cruz, US, led one of the simulation teams. His team found that such an impactor would produce huge amounts of lava – enough to cover the planet in an ocean of molten rock somewhere between 14 and 48 kilometres thick. That would have ended up erasing any record that an impact happened

(Excerpt) Read more at space.newscientist.com ...


TOPICS: News/Current Events
KEYWORDS: asteroid; catastrophism; faces; falsecolor; impact; mars

1 posted on 03/15/2007 2:14:29 PM PDT by blam
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To: SunkenCiv

Catastrophism Ping.


2 posted on 03/15/2007 2:15:27 PM PDT by blam
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To: blam
Richard Knows!


3 posted on 03/15/2007 2:15:38 PM PDT by IllumiNaughtyByNature (When Can We expect a Movie about Milli Vanilli?)
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To: blam

Several years ago Van Flandern and Hoagland put forth the hypothesis that Mars was hit by an exploding planet of which it was the secondary of the two-planet system. The asteroid belt is what remains of the larger body, and half of the crust of Mars including its atmosphere and most of its oceans were blown off in the explosion.


4 posted on 03/15/2007 2:19:46 PM PDT by RightWhale (300 miles north of Big Wild Life)
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To: blam
Mars Pole Holds Enough Ice to Flood Planet, Radar Study Shows

At a depth of 36 feet.

5 posted on 03/15/2007 2:20:41 PM PDT by blam
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To: blam

I know about the one "face," but I never heard about a second one.


6 posted on 03/15/2007 2:29:28 PM PDT by Maceman (This is America. Why must we press "1" for English?)
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To: K4Harty

I've seen the face on the left, but the one on the right I'm guessing is the second face. Quite scary, especially those letters tatooed on his arm.


7 posted on 03/15/2007 2:35:06 PM PDT by mtbopfuyn (I think the border is kind of an artificial barrier - San Antonio councilwoman Patti Radle)
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To: mtbopfuyn

I NEVER pass up an opportunity to post this pic. ;o)


8 posted on 03/15/2007 2:52:03 PM PDT by IllumiNaughtyByNature (When Can We expect a Movie about Milli Vanilli?)
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To: blam

Maybe a large asteroid that had the remarkable likeness of Kerry?


9 posted on 03/15/2007 2:55:04 PM PDT by coloradan (Failing to protect the liberties of your enemies establishes precedents that will reach to yourself.)
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To: K4Harty
That's a picture of the Creature From the Black Lagoon taken with vaseline on the lens.

Ya can't fool me!

FMCDH(BITS)

10 posted on 03/15/2007 4:22:45 PM PDT by nothingnew (I fear for my Republic due to marxist influence in our government. Open eyes/see)
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To: nothingnew
Double N,

You stumped me with the last acronym? Help!

11 posted on 03/15/2007 5:49:42 PM PDT by IllumiNaughtyByNature (When Can We expect a Movie about Milli Vanilli?)
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To: K4Harty; nothingnew
You stumped me with the last acronym? Help!

 NN, hope you don't mind me jumping in...

From

My

Cold

Dead

Hands

(Blood

In

The

Streets)

12 posted on 03/15/2007 6:51:19 PM PDT by zeugma (MS Vista has detected your mouse has moved, Cancel or Allow?)
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To: zeugma

Thanks Z-man!


13 posted on 03/15/2007 6:52:32 PM PDT by IllumiNaughtyByNature (When Can We expect a Movie about Milli Vanilli?)
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Red Planet's Ancient Equator Located
Scientific American (online) | April 20, 2005 | Sarah Graham
Posted on 04/24/2005 11:18:25 PM EDT by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1390424/posts

Giant Impact Basins Trace the Ancient Equator of Mars
Jafar Arkani-Hamed
Earth and planetary sciences, McGill University
Montreal, Quebec, Canada
http://www.agu.org/pubs/pip/2004JE002343.pdf

New Theory: Catastrophe Created Mars' Moons
space.com | 29 Jul 03 | Leonard David
Posted on 07/29/2003 8:56:47 AM PDT by RightWhale
http://www.freerepublic.com/focus/news/954539/posts

similar, but extrasolar:

Spitzer Sees the Aftermath of a Planetary Collision
Universe Today | Jan. 10, 2005 | Dolores Beasley and Gay Yee Hill
Posted on 01/13/2005 8:50:18 PM PST by SunkenCiv
http://freerepublic.com/focus/f-chat/1320521/posts


14 posted on 03/15/2007 7:38:14 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: blam

Immense ice deposits found at south pole of Mars
Reuters via Yahoo! | 3-16-07 | Will Dunham
Posted on 03/15/2007 4:01:58 PM EDT by Pharmboy
http://www.freerepublic.com/focus/news/1801465/posts


15 posted on 03/15/2007 7:39:47 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: blam
There's actually less to the "face on Mars" than meets the eye, or more specifically, the camera technology of twenty years ago.

Wait for the animation...

Skeptical Inquirer, April 1998

16 posted on 03/15/2007 8:51:51 PM PDT by jiggyboy (Ten per cent of poll respondents are either lying or insane)
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To: blam
Mars's southern hemisphere is higher and more heavily cratered than the northern hemisphere, suggesting it is older terrain.

So is the northern hemisphere the sea bed?
17 posted on 03/15/2007 8:58:53 PM PDT by aruanan
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To: jiggyboy
There's actually less to the "face on Mars" than meets the eye, or more specifically, the camera technology of twenty years ago.

Not really. The "newer" shot has been significantly more fiddled with using computer processing techniques.
18 posted on 03/15/2007 9:01:05 PM PDT by aruanan
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Two Faces Have I by Lou Christie

19 posted on 03/15/2007 10:09:01 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: blam; 75thOVI; Alice in Wonderland; AndrewC; Avoiding_Sulla; BenLurkin; Berosus; Brujo; CGVet58; ...
Thanks blam.
Catastrophism
 
Catastrophism ping list
· join · view topics · view or post blog · bookmark · post new topic ·

20 posted on 03/15/2007 10:10:11 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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http://webster.aip.org/enews/physnews/1999/split/pnu432-3.htm

Physics News Update

The American Institute of Physics Bulletin of Physics News

Number 432 (Story #3), June 7, 1999 by Phillip F. Schewe and Ben Stein

THE SURFACE OF MARS has been mapped to 13-meter precision, better than for some places on Earth. Laser light sent from and returning to the orbiting Mars Global Surveyor spacecraft reveals that the southern hemisphere is one big highland (6 km higher) compared to the northern hemisphere. Surface water, if there was any, would have collected in the North, although there is not yet definitive proof of any boreal ocean. One thing that is known about the northern lowland: it is the flattest place in the solar system. The South's elevation is due at least in part to an immense amount of material raised during an ancient impact which fashioned a huge crater known as the Hellas basin. (Science, 28 May 1999.)


21 posted on 03/15/2007 10:15:25 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: jiggyboy; aruanan

The main difference between the two shots is that in the earlier shot, "The Face" is made up of about three dozen pixels. The Face on Mars is indeed an artifact, but it is merely the artifact of the Viking orbiter camera resolution.


22 posted on 03/15/2007 10:22:23 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: SunkenCiv
I heard Hoagland the other night, still defending it as a non-natural structure. "Atmosphere's too thin to carve...".

But nothing about cosmic collisions.

23 posted on 03/15/2007 10:54:32 PM PDT by Calvin Locke
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To: Calvin Locke

Heh... the atmosphere's too thin to carve, but apparently just thick enough (similar to Earth's at 40 miles altitude -- Everest is about six miles) to support a civilization. ;')


24 posted on 03/16/2007 10:26:35 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: SunkenCiv

Excellent point. But, that was then, and this is now, and after the Martians built "the face", they migrated to Earth because Mars' atmosphere was being blown away by global warming caused by Martian activity.


25 posted on 03/16/2007 10:41:21 PM PDT by Calvin Locke
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To: Calvin Locke

:') That's precisely my point -- if the atmosphere has thinned out and destroyed the supposed civilization, how can Hoaxland claim that it was previously "too thin to carve"? As is generally the case, he's full of it.


26 posted on 03/16/2007 11:03:50 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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Hey, someone was bound to...
Image and video hosting by TinyPic

27 posted on 03/16/2007 11:08:28 PM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: SunkenCiv
Not to defend Hoagland, but the difference between he and Algor is that if you remove the huckstering, Hoaxie actually knows stuff, and can be entertaining.

And he has a sense of humor too.

However, as a taxpayer, I'm insulted that he wants NASA to drop everything to chase after his personal white whales.

I sometimes think he's a NASA plant to hype it's funding requests to they can hire even more astronauts to go crazy sitting around doing nothing for a decade or more.

28 posted on 03/17/2007 7:38:19 AM PDT by Calvin Locke
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To: Calvin Locke

:')


29 posted on 03/17/2007 7:57:13 AM PDT by SunkenCiv (I last updated my profile on Sunday, March 11, 2007. https://secure.freerepublic.com/donate/)
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To: KlueLass; texasredhead8712

Here's a Catastrophism ping list topic. This one shows up at the top, but is the last of the ones I've pinged you two to. :')


30 posted on 03/24/2007 7:29:34 PM PDT by SunkenCiv (I last updated my profile on Saturday, March 24, 2007. https://secure.freerepublic.com/donate/)
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Spitzer Sees the Aftermath of a Planetary Collision
 
Catastrophism
 
· join · view topics · view or post blog · bookmark · post new topic · subscribe ·
 

31 posted on 02/27/2011 7:13:40 PM PST by SunkenCiv (The 2nd Amendment follows right behind the 1st because some people are hard of hearing.)
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To: IllumiNaughtyByNature; SunkenCiv; blam
Your image is the original 1976 very low resolution image from the Viking probe. Much higher res images have been coming back for the last dozen years starting around 98-99, e.g.

http://nssdc.gsfc.nasa.gov/planetary/mgs_cydonia.html

That image shows straight lines and Bezier curves on a three-mile scale; Ma Nature don't do stuff like that.

Most interesting new photo from the neighborhood of Mars is the HIRISE image of Phobos:

In fact if you do a google search on just "phobos", that image is now the first item that turns up. That's right, real moons are supposed to be made out of dirt and green cheese and stuff like that which doesn't reflect light all over the place and can't be formed into planks like that. As Hoagland says, you can almost count the rivets.

32 posted on 05/28/2011 5:20:10 PM PDT by wendy1946 (Bork Obunga; Before he borks you...)
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To: wendy1946
Univ. of Az may be claiming some sort of a stupid copyright on that picture now. Here's a copy saved off before that happened, again Mars' little metallic moon Phobos:

Photobucket

33 posted on 05/28/2011 5:25:27 PM PDT by wendy1946 (Bork Obunga; Before he borks you...)
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