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Old 23rd September 2004, 06:17 AM   #21
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Hi Trev,

The mirror they left on the moon was a corner cube array (many sites on the 'net) which refelcts the light back directly to it's source.
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Old 23rd September 2004, 06:20 AM   #22
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Same as what they use on sats, makes more sence!, though, you would want to have minimal movment cos you would get light scatter on the laser beam if its moving across that reflector.

http://www.edmundoptics.com/onlineca...productID=2088

Trev

EDIT: Ive moved this thread over to Off Topic
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Old 23rd September 2004, 06:43 AM   #23
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Default Re: Re: Re: Hey Professor......

Quote:
Originally posted by ace3000_1
Dont laugh
No laughing here friend. Vancouver Prune was quick on the draw with the info.

I'm glad you caught what I meant ace.

Cal
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Old 23rd September 2004, 02:05 PM   #24
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Default Photo of moon from aircraft/

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File Type: jpg picture of moon from aircraft.jpg (23.2 KB, 91 views)
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Old 23rd September 2004, 02:27 PM   #25
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Geez Circlotron,

I'm glad that shot's not any bigger or we might be able to see one of those infamous black holes I keep hearing about.

Cal
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Old 23rd September 2004, 03:10 PM   #26
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Default Re: No Moon Landings ever Took Place...!!

Quote:
Originally posted by mikeks
just watched a documentary examining evidence that the Apollo moon landings were a 40 billion dollar US government hoax.....

The case for the prosecution is compelling......

Japan intends to send a probe up to the moon to take the first close up 'photos of the claimed landing sites....

I wait with bated breath....

Uhm, maybe you should just start here and save the sardines....

http://www.badastronomy.com/bad/tv/foxapollo.html

-Bruce
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Old 23rd September 2004, 04:01 PM   #27
sss is offline sss  Israel
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i dont think u need to put a mirror on the other side to measure distance
i dont know how its done , i know its done by laser , but i'm sure u dont need a mirror !
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Old 23rd September 2004, 04:20 PM   #28
edpgc is offline edpgc  United Kingdom
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You shine a laser at it, and then start your stop watch and stop it when you get a photon back. You know the speed of light, thererfore distance of the moon. Obviously u need a big telescope and a big laser.

I'd like to know how I can see 'live' satellite imagery though!
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Old 23rd September 2004, 04:27 PM   #29
sss is offline sss  Israel
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i'm in the military and we got many toys to calculate distance , its using laser and u dont need to put a mirror on the other side
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Old 23rd September 2004, 04:39 PM   #30
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Quote:
i dont think u need to put a mirror on the other side to measure distance
The way to measure the distance with a laser is basically the same how radar works. You have to have the signal in a radar to bounce back to its source/ sensor/ antenna, the time it takes for that signal to come back is calculated out to work out the distance. In space they mainly use IR and x-rays, not so much laser as laser is realy more of a tool for calibrating orbits. Laser in space is also actually an energy that has the potional to move things, ( depending on power ofcourse), and from an Imax film that i watched, NASA is planing in the future to have a laser powerd ship in space for far distance space travel.

So with a laser being used as a radar, the laser is pointed at an object that reflects the light back, the time it takes for the beam to come back is then calculated to get the distance.

Trev
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