Re: [Texascavers] WOW! More detail from the crater holes on Mars!!!

[Don Cooper]

I respect your skepticism - but this pic does not look fake in any way to
me.
-WaV

On 8/30/07, George Nincehelser  wrote:
>
> I've no experience evaluating photos like this, but it just looks odd to
> me.
>
> I think what bothers me is that shadow is so straight.  Wouldn't you
> expect it to be more curved?
>
> Also, when you look at the wall, I see something that looks like a barren
> rocky surface with a small impact crater.
>
> The pictures just look faked to me.  After seeing these pictures of
> Martian "water" 
> (http://space.newscientist.com/article/dn12026-mars-rover-finds-puddles-on-the-planets-surface.html
> ) and comparing them to the center part of the Burns Cliff Panorama (
> http://us.st11.yimg.com/us.st.yimg.com/I/skyimage_1962_13285574) taken by
> the rover Oppertunity, I think some people are using too much imagination
> and image processing for their own good.
>
> George
>

Re: [Texascavers] WOW! More detail from the crater holes on Mars!!!

[George Nincehelser]

I've no experience evaluating photos like this, but it just looks odd to me.

I think what bothers me is that shadow is so straight.  Wouldn't you
expect it to be more curved?

Also, when you look at the wall, I see something that looks like a barren
rocky surface with a small impact crater.

The pictures just look faked to me.  After seeing these pictures of Martian
"water" (
http://space.newscientist.com/article/dn12026-mars-rover-finds-puddles-on-the-planets-surface.html)
and comparing them to the center part of the Burns Cliff Panorama (
http://us.st11.yimg.com/us.st.yimg.com/I/skyimage_1962_13285574) taken by
the rover Oppertunity, I think some people are using too much imagination
and image processing for their own good.

George

Re: [Texascavers] WOW! More detail from the crater holes on Mars!!!

[Gregg]

Well, the gig is up!

You can now tell that the walls are overhanging.

I downloaded the uncompressed file of the original photo a few weeks ago 
and did my own processing.  I could see both the illuminated wall and 
the shadowed wall in reflected light, both of them far too thin for that 
to be anything other than overhanging or the very dark submartian lake 
that some people have speculated about.


Now I get to go download the next zillion MB file and try to hack it 
with my tiny amount of RAM



Gregg



Don Cooper wrote:
This is copied from a post Lee Skinner placed on the Yahoo 
Cave-Diggers group:



NASA's Mars Reconnaissance Orbiter's HiRISE camera has a new photo of
 
one of the pits on Mars:


Dark pits on some of the Martian volcanoes have been speculated to be 
entrances into caves. A previous HiRISE image, 


<
http://hirise.lpl.arizona.edu/PSP_003647_1745> looking essentially 
straight down, saw only darkness in this pit.


This time the pit was imaged from the west. Since the picture was taken
 
at about 2:30 
p.m. local (Mars) time, the sun was also shining from the
 
west. We can now see the eastern wall 
<
http://hirise.lpl.arizona.edu/images/2007/details/cut/PSP_004847_1745_cut_b.jpg> 
of the pit catching the sunlight.


This confirms that this pit is essentially a vertical shaft cut through
 
the lava flows on the flank of the volcano. Such pits form on similar 


volcanoes in Hawaii and are called "pit craters." They generally do not
 
connect to long open caverns but are the result of deep underground 
collapse. From the shadow of the rim cast onto the wall of the pit we 

can calculate that the pit is at least 78 meters (255 feet) deep. The 
pit is 150 x 157 meters (492 x 515 feet) across.





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[Texascavers] WOW! More detail from the crater holes on Mars!!!

[Don Cooper]

This is copied from a post Lee Skinner placed on the Yahoo Cave-Diggers
group:

NASA's Mars Reconnaissance Orbiter's HiRISE camera has a new photo of

one of the pits on Mars:

Dark pits on some of the Martian volcanoes have been speculated to be
entrances into caves. A previous HiRISE image,
 looking essentially
straight down, saw only darkness in this pit.

This time the pit was imaged from the west. Since the picture was taken

at about 2:30 p.m. local (Mars) time, the sun was also shining from the

west. We can now see the eastern wall

of the pit catching the sunlight.

This confirms that this pit is essentially a vertical shaft cut through

the lava flows on the flank of the volcano. Such pits form on similar
volcanoes in Hawaii and are called "pit craters." They generally do not

connect to long open caverns but are the result of deep underground
collapse. From the shadow of the rim cast onto the wall of the pit we
can calculate that the pit is at least 78 meters (255 feet) deep. The
pit is 150 x 157 meters (492 x 515 feet) across.