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Author Topic: Can a giant telescope allow people in London to see New York?  (Read 6165 times)

torga tembisa

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torga tembisa  asked the Naked Scientists:

Good day Dr Smith, I enjoy your slot on 702 talk radio in South Africa weekly! I look forward to you answering questions that one would be thinking about and had no clue who to ask! Your wealth of Knowledge is astounding!

I have a very simple question, hoping to get a simple answer:

I was watching Sky News just the other day, when I saw a giant `telescope` linking London and New York whereby people from this two Cities wave at it each other and get an almost instantaneous response.

What are the mechanics behind this ,and what technology has been used.

Regards
Justin Mokgatlhane

Johannesburg, South Africa

What do you think?


 

Offline techmind

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Can a giant telescope allow people in London to see New York?
« Reply #1 on: 18/06/2008 14:27:49 »
I presume you're referring to this: http://news.bbc.co.uk/1/hi/world/americas/7415911.stm

It looks like an artist's project(!)

From what I have seen on the BBC story, I presume it's basically just a (perhaps high-definition) TV camera and a large (back-projected?) screen. The two ends will be connected via the internet and/or a commercial off-the-shelf point-to-point data-link.
Sorry to spoil the myth, but the rest of the construction is purely for "effect".

Now if you could just pursuade the guys at the other end to jump (or clap) in time with you, you could begin to estimate the round-trip delay. I'd guess it's a second or two (probably at least as much delay in the video compression as there is in the data link itself!).
 

Offline lightarrow

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Can a giant telescope allow people in London to see New York?
« Reply #2 on: 19/06/2008 08:13:37 »
torga tembisa  asked the Naked Scientists:

Good day Dr Smith, I enjoy your slot on 702 talk radio in South Africa weekly! I look forward to you answering questions that one would be thinking about and had no clue who to ask! Your wealth of Knowledge is astounding!

I have a very simple question, hoping to get a simple answer:

I was watching Sky News just the other day, when I saw a giant `telescope` linking London and New York whereby people from this two Cities wave at it each other and get an almost instantaneous response.

What are the mechanics behind this ,and what technology has been used.

Regards
Justin Mokgatlhane

Johannesburg, South Africa

What do you think?

A real telescope couldn't be, earth is round...
 

Offline turnipsock

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Can a giant telescope allow people in London to see New York?
« Reply #3 on: 19/06/2008 13:00:25 »
torga tembisa  asked the Naked Scientists:

Good day Dr Smith, I enjoy your slot on 702 talk radio in South Africa weekly! I look forward to you answering questions that one would be thinking about and had no clue who to ask! Your wealth of Knowledge is astounding!

I have a very simple question, hoping to get a simple answer:

I was watching Sky News just the other day, when I saw a giant `telescope` linking London and New York whereby people from this two Cities wave at it each other and get an almost instantaneous response.

What are the mechanics behind this ,and what technology has been used.

Regards
Justin Mokgatlhane

Johannesburg, South Africa

What do you think?

A real telescope couldn't be, earth is round...

I don't know where you get these ideas.

Anyway, here is a simpler solution...http://www.earthcam.com/usa/newyork/timessquare/index.php?cam=canonts
 

Offline techmind

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Can a giant telescope allow people in London to see New York?
« Reply #4 on: 21/06/2008 22:35:45 »
A real telescope couldn't be, earth is round...

Well, you could put some strategically placed prismatic lens elements to bend the light around the earth curvature... ;-)
 

Offline Alan McDougall

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Can a giant telescope allow people in London to see New York?
« Reply #5 on: 29/06/2008 11:00:55 »
Justin,


Hello from a fellow South African. I know what you mean. Diregarding the curvature of the earth and atmospheric pollution of course this is possible. Already you can see your own house using googol earth.

Madiba is the greatest person on earth bless him on his 90 th birthday.

Alan
 

paul.fr

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Can a giant telescope allow people in London to see New York?
« Reply #6 on: 29/06/2008 21:57:48 »
Madiba is the greatest person on earth bless him on his 90 th birthday.

Surely you mean terrorist, who should still be in jail?
 

Offline rosalind dna

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Can a giant telescope allow people in London to see New York?
« Reply #7 on: 29/06/2008 22:09:37 »
Madiba is the greatest person on earth bless him on his 90 th birthday.

Surely you mean terrorist, who should still be in jail?

No, pensioner and ex-president of South Africa that is whom, Mandela is after having spent 27 years in jail until 1990 !
 

paul.fr

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Can a giant telescope allow people in London to see New York?
« Reply #8 on: 29/06/2008 22:16:04 »


No, pensioner and ex-president of South Africa that is whom, Mandela is after having spent 27 years in jail until 1990 !

I think you will find he was a terrorist before that. If you wish to tell me otherwise then please start a topic in chat, where it can be discussed.
 

Offline Alan McDougall

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Can a giant telescope allow people in London to see New York?
« Reply #9 on: 30/06/2008 08:32:24 »
I am sorry I posted this friendly reply

Quote
Surely you mean terrorist, who should still be in jail?

You need a forgiving soul like this wherever you live!

Be a man and delete your unpleasant post

Alan
 

Offline syhprum

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Can a giant telescope allow people in London to see New York?
« Reply #10 on: 12/07/2008 10:09:51 »
I think the question is would the resolution of the best telescopes be sufficient to make out any detail of a person 3000 miles away.
I would estimate ignoring atmospheric effects the resolution at 3000 miles would amount to about 12" per pixel, not good enough to make out much detail
 

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Can a giant telescope allow people in London to see New York?
« Reply #10 on: 12/07/2008 10:09:51 »

 

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