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Originally posted by Phage
reply to post by Char-Lee
Here is the image from which it comes. In it you can see many more sand dunes, some inside craters, some in ravines, some not.
hirise-pds.lpl.arizona.edu...
The ravines in which the dunes lie change directions and as pointed out, some of these ravines are probably collapsed lava tubes but ancient water courses would also change directions.
The way that the formations change direction at certain points is so unlike sand yet lava does do this.
Originally posted by spiritualarchitect
reply to post by Char-Lee
I think there is something *wrong* in the sand dune theory, simply by where and how the patterns run.
They want us to believe that the wind is running down thur these hollows and making all these twist and turns while not affecting the plains around them. It is not impossible, because we are dealing with a different planet. But lave or ice or even tubes make much more sense.
Why would a sand dune run underground from the "Fort" to a crater?
There are some powerful winds on Mars, but just how powerful was only discovered recently. David Choi of NASA's Goddard Space Flight Center used images of dust devils taken by Mars Reconnaissance Orbiter's HiRISE camera to determine the speed of the swirling dust devils.
So just how fast was the wind blowing on Mars? Really fast. In some cases the wind speeds were 45 m/s (162 km/hr), well above 33 m/s (118.8 km/hr) which constitutes hurricane force winds on Earth. The typical wind speed was from 20-30 m/s (72-108 km/hr).
What effects would you expect to see on the plains? The wind doesn't make "twists and turns" but wind doesn't always blow in the same direction either. When the wind blows in the right direction, parallel to the ravine, it creates dunes inside it (and may be somewhat "guided" by the ravine). When it is blowing in another direction it does not and the dunes are protected from the wind by the walls of the ravine. When you see dunes in ravines of very different directions it means they were not formed at the same time.
They want us to believe that the wind is running down thur these hollows and making all these twist and turns while not affecting the plains around them.
Can you see dunes underground? I can't.
Why would a sand dune run underground from the "Fort" to a crater?
"Winds" on Mars are insufficient to build large dunes.
So you agree that the "geologists" conclusions are inaccurate? I wonder what else they were wrong about.
That image above was filmed in 2010. The geo report as you can see was done in 2001.
Does it show dunes underground?
Watch the video you were provided in this thread.
Originally posted by spiritualarchitect
reply to post by Phage
That image above was filmed in 2010. The geo report as you can see was done in 2001.
"Can you see dunes underground? I can't."
Watch the video you were provided in this thread.
Originally posted by michael1983l
I ain't gona waste my time watching a YouTube clip labled PlanetX Debate 2008. Sorry.
What makes you think that a video that was posted 5 years ago, has anything groundbreaking to add to ATS today in 2013?edit on 9-2-2013 by michael1983l because: (no reason given)
Originally posted by BigfootNZ
Its odd I see that pic and wonder how anyone can see tubes... especially when in the upper 3rd on the right you can clearly see individual scattered dunes or tube ribs that arent lined up with any other and that are clearly not attached to any series of others as well as tube 'ribbing' that stretchs, gets thinner or thicker or tappers off to nothing.
I mean in that large upper trench the 'ribbing' of the tubes varies drastically in size, number, thickness, even placement along the direction the 'tube' is going and people think these are somehow manufactured objects? All i see is a long length of raised ground and cliffs where the wind is funneled north east along this line of cliffs where it eventually strikes the large mountain or hill at the top right corner and the wind is then funneled around it to either side down the large open trench to the left as well as off to the right and out of frame... and lo and behold, you have sand dunes all lined up with the direction of the wind as it travels in said directions. And also notice the sand dunes are strongest along the upper cliff of that big trench left of the mountain/hill where the wind would be funneled after hitting its slopes, yet none on the opposite side of the trench besides a few small and scattered ones.