| Author |
Message |
Virpi Luukkonen (Virpi)
| | Posted on Wednesday, April 13, 2005 - 1:22 pm: |      |
Hi! I'm a new user.. Here's a puzzle: A man is outdoors taking a walk. Suddenly he sees the Great Wall of China. How is this possible, since he is thousands of miles from China? |
(Stuccosalt)
| | Posted on Wednesday, April 13, 2005 - 1:58 pm: |      |
Is he on the moon? |
(Stuccosalt)
| | Posted on Wednesday, April 13, 2005 - 1:59 pm: |      |
And hi, by the way! Welcome aboard! |
Sam Greene (Pandora)
| | Posted on Wednesday, April 13, 2005 - 2:34 pm: |      |
Hi and welcome to the forum Did he see it on a TV screen in a high street? |
Kapil Kapur (Dinkie)
| | Posted on Wednesday, April 13, 2005 - 2:48 pm: |      |
is he an astronaut ? out for a space walk ? |
Virpi Luukkonen (Virpi)
| | Posted on Thursday, April 14, 2005 - 6:59 am: |      |
Thanks guys and yes... you guessed it. This one was rather easy, I think. I'll come up with something more difficult next time :-) /b{******** SPOILER *********** The man was walking on the moon and saw the Great Wall from there, as it is the single man-made structure visible to outer space.} |
Kapil Kapur (Dinkie)
| | Posted on Thursday, April 14, 2005 - 8:51 am: |      |
oops sorry for guessing it so early !!!! |
Benjamin Moore (Zenith)
| | Posted on Thursday, April 14, 2005 - 9:09 am: |      |
In fact, it is actually a myth that the Great Wall of China is visable from the moon. The following got printed in New Scientist Last Word.
Quote:A person with perfect eyesight is able to resolve up to about one minute of arc without binoculars or a telescope. The Great Wall of China is, very approximately, 20 feet (6 metres) wide. This means that it is not directly visible above about 70,000 feet (20Km), or just over twice the height of Mount Everest. Even if its shadow is taken into account, this would only make it visible, in places, up to perhaps about 200,000 feet (60km) at the most which, because of atmospheric drag, is still below the height necessary for a stable orbit.
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(Stuccosalt)
| | Posted on Thursday, April 14, 2005 - 1:18 pm: |      |
Dinkie - It's hard to tell sometimes how puzzles will go over - I've written some that I've thought were completely diabolical that were solved in a question or two, and others that I noted as "Quickies" that took forever -- just depends what track everyone gets on. I look forward to your next puzzle! |
(Stuccosalt)
| | Posted on Thursday, April 14, 2005 - 1:24 pm: |      |
Zenith - I heard that a while ago, and as I remember, it turned out the Great Wall is less visible than a number of other manmade structures from space: See http://www.snopes.com/science/greatwal.htmSnopes</a>. |
(Stuccosalt)
| | Posted on Thursday, April 14, 2005 - 1:24 pm: |      |
sorry, should've just read http://www.snopes.com/science/greatwal.htm |
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