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It's the frequency that changes, not the speed.

Jack Cannon wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related 
> institutions.
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>
>
> It seems to be very well settled that the speed of light (c) is a 
> fixed constant that is not influenced by the relative speed of the 
> observer.  It is about 186,282.397 miles per second in a vacuum.  c 
> remains a constant irrespective of the relative speed of the observer 
> with respect to the light source.  In other words, an observer moving 
> towards the light source measures the same c as well as that measured 
> by an observer moving away from the light source.
>
> It is also true that ancient galaxies exhibit a red shift in the 
> observed light as viewed from earth.  This is due to the doppler shift 
> which indicates that the galaxy is moving away from us.
>
> The question that I have is that a doppler shift (or red shift) is not 
> possible unless the light being observed is moving slower (causing a 
> longer wavelength) at the point of observation than the light that is 
> emitted from the point source.  However it is not possible for the 
> speed of light to be slower than c at the point of observation 
> irrespective of the relative velocities between the source and observer.
>
> Can anyone explain how a doppler shift can the observed from an 
> ancient galaxy if the speed of light does not change?
>
> Jack Cannon
> [log in to unmask]
>
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-- 

           Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

             (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
              Obz Site:  39° 15' 7" N, 121° 2' 32" W, 2700 feet
            
                 "We are operating this planet like a business in
                  liqudation." -- Al Gore, 2006
            
                    Web Page: <www.speckledwithstars.net/>

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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.

Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.

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