[LINK] More with google maps - Uluru and Great Wall

[Ivan Trundle]

On 03/05/2007, at 2:21 AM, Howard Lowndes wrote:

> Alastair Rankine wrote:
>> On 02/05/2007, at 7:55 PM, Ivan Trundle wrote:
>>>> Took a long time to find the great wall of China. I don't know  
>>>> what they're talking about when they say they can spot it from  
>>>> space.
>>>
>>> You can't - it's an urban myth.
>> Well, does 180 miles up qualify as "space" ? If so, then the Great  
>> Wall *is* visible from space, see http://www.snopes.com/science/ 
>> greatwal.htm
>
> The Great Wall should be visible as I have a desktop wallpaper of  
> the Mars Rover at the Victoria crater and that was taken by the  
> Mars Orbiter from 279km above the Martian surface, and the Mars  
> Rover is only the size of a golf cart and you can even discern its  
> tracks and the shadow of it's camera mast.

279km above Mars is not equivalent to 279km above Earth (considerable  
atmospheric differences) - and further, contrast and reflectivity  
determine object visibility (putting aside the resolution of the  
image capturing process), at any distance.

I'll concede that the Great Wall is visible from certain places - now  
how about the other claim - that the WA Dingo Fence* is ALSO visible?  
There's a good deal of discussion on this one, too: even though it's  
only a fence...

iT