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OfflineDimensionX
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Registered: 09/26/07
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Messages in light?
    #8178052 - 03/21/08 10:41 PM (16 years, 2 months ago)

My understanding is that light can capture images. Would it be possible for us to shine light out into space with messages in the form of images for alien species to view? These messages would be traveling at the speed of light, so would travel faster than any other means we know of at the moment.

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InvisibleDieCommie


Registered: 12/11/03
Posts: 29,258
Re: Messages in light? [Re: DimensionX]
    #8178178 - 03/21/08 11:10 PM (16 years, 2 months ago)

Yes it would be possible to send messages in visible light.  I think SETI does look for messages at visible wavelengths.  But they also look in other wavelengths (radio, microwaves). 

Radio and microwave, all EM waves travel at the speed of light.  (Gravity waves too, theoretically.  But it would be quite hard to communicate using them :smile: )

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OfflineDimensionX
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Re: Messages in light? [Re: DieCommie]
    #8178203 - 03/21/08 11:17 PM (16 years, 2 months ago)

Thats interesting, so does that mean that EM waves don't have any mass either? I wonder if we could find a way to make a light speed communication system on earth using light or EM waves. lol communicating with gravity waves sounds like it could be painful.

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InvisibleDieCommie


Registered: 12/11/03
Posts: 29,258
Re: Messages in light? [Re: DimensionX]
    #8178213 - 03/21/08 11:21 PM (16 years, 2 months ago)

Quote:

DimensionX said:
Thats interesting, so does that mean that EM waves don't have any mass either? I wonder if we could find a way to make a light speed communication system on earth using light or EM waves.


Sure, we do. Satellites use EM waves, FM/AM radio uses it... tons of shit. Of course the lag time to send and receive it means the end time is longer than the speed of light.

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OfflineDimensionX
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Re: Messages in light? [Re: DieCommie]
    #8178218 - 03/21/08 11:23 PM (16 years, 2 months ago)

Cool, so our radio waves would already be traveling out into space at the speed of light?

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InvisibleDieCommie


Registered: 12/11/03
Posts: 29,258
Re: Messages in light? [Re: DimensionX]
    #8178241 - 03/21/08 11:29 PM (16 years, 2 months ago)

Yep.  Hertz sent the first radio signals in the late 1800s.  Large scale ones were sent only a few decades later.  So our messages now occupy a sphere in space with a radius of about 100 light years.  :thumbup:  ( I dont know if thats a good thing or a bad thing...:confused: )

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OfflineDimensionX
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Re: Messages in light? [Re: DieCommie]
    #8178313 - 03/21/08 11:59 PM (16 years, 2 months ago)

Me neither. I'm not sure how an alien would react to the inane and bizarre blather we fill our radio waves with. I'm sure it would be the equivalent of a human saying "wtf???!!!".

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