Posted on 04/24/2005 8:18:25 PM PDT by SunkenCiv
Jafar Arkani-Hamed of McGill University discovered that five impact basins--dubbed Argyre, Hellas, Isidis, Thaumasia and Utopia--form an arclike pattern on the Martian surface. Three of the basins are well-preserved and remain visible today. The locations of the other two, in contrast, were inferred from measurements of anomalies in the planet's gravitational field... a single source--most likely an asteroid that was initially circling the sun in the same plane as Mars--created all five craters. At one point the asteroid passed close to the Red Planet... and was broken apart by the force of the planet's gravity. The resulting five pieces subsequently slammed into Mars along its then equator. The center of the circle inscribed by the five craters, which marks the planet's ancient south pole, lies at present day latitude -30 and longitude 175.
(Excerpt) Read more at sciam.com ...
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Images reveal 'sea of ice' near Mars' equator
Associated Press | Feb 26, 2005
Posted on 02/26/2005 4:02:49 AM PST by FYREDEUS
http://www.freerepublic.com/focus/f-news/1351506/posts
"The point is that the ice is very recent: it appears to still be there, covered beneath a layer of dust and ash," John Murray of Britain's Open University said in a telephone interview.
The Scars of MarsIt is to be noted that all 15 of the largest craters of Mars are in the Hemisphere of Craters. It is also noteworthy that the massive lava outflows of Argyre, Hellas, and Isidis undoubtedly have spread and occluded a certain significant number of craters Thus our figure of 3068 craters 20 miles and larger in diameter has been masked by these lava outflows; the original figure was even larger before lava flow and before larger craters occluded some smaller ones.
by Donald W. Patten
January 1991
If there is a shift from our Table III, therefore, it will probably be in the direction of an even greater extreme. And the 7 percent crater count in the Opposite Hemisphere may in fact be somewhat larger than the original impact situation.
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Ooooookay. What tipped Mars off its' then axis?
It may have been the impacts. Naturally, the only thing the article is concerned with is whether there's any water on Mars.
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
"...theoretical modeling of the polar wander of Mars showed that the rotation axis of Mars could have moved by as much as 70 degrees within a geologically short time period in response to the emplacement of Tharsis mass [Spada et al., 1996]. The theoretical modeling also demonstrated the crucial effects of the mantle viscosity and the thickness of the rigid lithosphere on the polar wander."
Dang. No Velikovsky?
ping
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
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
"The original heliocentric asteroid was likely fragmented into many pieces and the orbital motion of 5 large fragments evolved rapidly and produced the giant basins. Many small bodies likely scattered and spread over a larger volume, and some out of the orbital plane of the original asteroid. It is possible that these small fragments were eventually collapsed on the equatorial plane and impacted on Mars at very low angles, creating some of the class 3 elliptical craters reported by Schultz and Lutz-Garihan [1982]. Also, there is no reason to believe that all large basins of Mars originated from fragmentation of a single asteroid. Some large basins, such as Chryse, Ares, and buried basins may have been produced by other heliocentric asteroids."
It might be that all the planets flop around unless they have a large moon to provide stability.
THE TWIN TILTS OF THE SPIN AXES OF MARS AND EARTH
Donald W. Patten and Samuel R. Windsor
http://www.kronia.com/symposium/patten.txt
"According to Roche's Limit, fragmentation of a smaller approaching body would occur at about 5,500 miles from the center of Mars, which is 3,400 miles above its surface. Almost opposite to the giant Hellas Crater is the gigantic Tharsis Bulge on Mars, some 4.5 miles high and 3,200 miles broad, scar piece # 3. A diagonal drawn from the center of Tharsis through the center of Hellas should give the trajectory of Astra, as it approached Mars, only to disintegrate into explosive fragments."
In the shadow of the Moon
New Scientist | 30 January 1999 | editors
Posted on 08/31/2004 8:42:25 AM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1203912/posts
18 posted on 08/31/2004 12:24:41 PM PDT by RightWhale
http://www.freerepublic.com/focus/f-chat/1203912/posts?page=18#18
New evidence for the Moon's soft middle
New Scientist | 14 February 2002 | Will Knight
Posted on 12/27/2004 2:29:35 PM PST by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1309193/posts
28 posted on 12/31/2004 9:21:42 AM PST by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1309193/posts?page=28#28
When the Days Were Shorter
Alaska Science Forum (Article #742) | November 11, 1985 | Larry Gedney
Posted on 10/04/2004 10:31:59 AM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1234919/posts
I think HC is onto something there. :')
"What tipped Mars off its' then axis?"
Could be Uranus.... (heh-heh)
Maybe it happened while he was walking Pluto.
[dead silence, then crickets chirping]
[dead silence, then crickets chirping]
aye-yup
THE TWIN TILTS OF THE SPIN AXES OF MARS AND EARTH
Donald W. Patten and Samuel R. Windsor
http://www.kronia.com/symposium/patten.txt
"Mars experienced two fragmentations on its Roche Limit. One was the demise of the tiny planet Astra, which was about the diameter of Pluto, perhaps 1,500 to 1,600 miles in diameter. The demise of Astra provided an ancient ring of debris around Mars, of which Deimos and Phobos are vestiges. Other small debris almost surely is still there, but has escaped detection by unsuspecting astronomers. Some of this debris very likely ruined the recent, and very expensive Mars space mission."
Electric Arcs in Planetary Science
Thunderbolts Picture of the Day | 3/7/2005
Posted on 03/07/2005 11:19:39 PM PST by Swordmaker
http://www.freerepublic.com/focus/f-chat/1358256/posts
When Dust Storms Engulf Mars
Thunderbolts Picture of the Day | Mar 24, 2005 | Mel Acheson
Posted on 03/28/2005 10:19:07 PM PST by Swordmaker
http://www.freerepublic.com/focus/f-chat/1372800/posts
Scientists: The Latest Mac Converts
eCommerce Times | 2/14/2004 | Robyn Weisman
Posted on 02/16/2004 2:08:15 AM PST by Swordmaker
http://www.freerepublic.com/focus/f-news/1078971/posts
Martian "Blueberries" in the Lab
Thunderbolts Picture of the Day | Mar 25, 2005
Posted on 03/28/2005 9:58:11 PM PST by Swordmaker
http://www.freerepublic.com/focus/f-chat/1372790/posts
Your expertise please.
Weird. Thanks for the post.
Long-Destroyed Fifth Planet May Have Caused Lunar Cataclysm, Researchers Say
SPACE dot COM | 18 March 2002 ,posted: 03:00 pm ET
By Leonard David, Senior Space Writer
Posted on 03/25/2002 2:42:10 PM PST by vannrox
http://www.freerepublic.com/focus/f-news/653287/posts
My pleasure.
If there were life on Mars wouldn't it pass gas?
Waterbury Republican-American | April 30, 2005 | AP Wire
Posted on 04/30/2005 6:34:08 PM PDT by Graybeard58
http://www.freerepublic.com/focus/chat/1394490/posts
reprise, and a bttt...
The Exploded Planet Hypothesis 2000
Evidence that Mars is a former moon
http://www.metaresearch.org/solar%20system/eph/eph2000.asp
"Especially significant in this regard is the fact that half of Mars is saturated with craters, and half is only sparsely cratered. Moreover, the crustal thickness has apparently been augmented over one hemisphere by up to 20 km or so, gradually tapering off near the hemisphere boundaries. This 'crustal dichotomy' is also readily seen in Martian elevation maps"
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
The interesting thing is that earth has a similar structure. The Pacific Ocean is a huge, somewhat round, hole in the crust. That is where the material that is now the moon supposedly came from. If half of Mars' crust is gone, that might, assuming structure indicates history, be where the asteroidal material came from. If so, the present orbits of the main belt asteroids and Mars not be the same as the original main body since before that event but some kind of average.
I wasn't sure that the crust was missing so much as the debris from the impacts altered the surface of the Hemisphere of Craters.
Half the surface is a kilometer or more lower than the other half. Like an ocean basin.
ping with a related topic:
Scientist: Asteroid May Hit Earth in 2029
Yahoo/AP | 12/23/04 | JOHN ANTCZAK
Posted on 12/23/2004 8:24:16 PM PST by hole_n_one
http://www.freerepublic.com/focus/news/1307719/posts
just a light ping for the early morning hours.
When the Days Were Shorter
Alaska Science Forum (Article #742) | November 11, 1985 | Larry Gedney
Posted on 10/04/2004 10:31:59 AM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1234919/posts
New evidence for the Moon's soft middle
New Scientist | 14 February 2002 | Will Knight
Posted on 12/27/2004 2:29:35 PM PST by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1309193/posts
In the shadow of the Moon
New Scientist | 30 January 1999 | editors
Posted on 08/31/2004 8:42:25 AM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1203912/posts
It does well as wallpaper.
Hey, thanks!
Maybe an idea for an FR topic? I didn't find it with a search:
First Shooting Star Seen from Mars
By Robert Roy Britt
Senior Science Writer
posted: 01 June 2005
01:01 pm ET
http://www.space.com/scienceastronomy/050601_mars_meteor.html
You're saying the equator of the planet has CHANGED??
:') Yeah, that's the upshot. Emilio Spedicato has an online article (somewhere) regarding how a big impact is sufficient to change the axis of rotation of the body so impacted.
There will be a live thread of the Tempel impact Sunday.
Ping me, if it's not too much trouble.
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