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Cornell University Explains Cosmological Redshift

August 9 2008 at 3:02 PM
 

 
http://curious.astro.cornell.edu/question.php?number=278
Cornell University: "In the case of distant objects where the expansion of the universe becomes an important factor, the redshift is referred to as the "cosmological redshift" and it is due to an entirely different effect. According to general relativity, the expansion of the universe does not consist of objects actually moving away from each other - rather, the space between these objects stretches. Any light moving through that space will also be stretched, and its wavelength will increase - i.e. be redshifted. (This is a special case of a more general phenomenon known as the "gravitational redshift" which describes how gravity's effect on spacetime changes the wavelength of light moving through that spacetime. The classic example of the gravitational redshift has been observed on the earth; if you shine a light up to a tower and measure its wavelength when it is received as compared to its wavelength when emitted, you find that the wavelength has increased, and this is due to the fact that the gravitational field of the earth is stronger the closer you get to its surface, causing time to pass slower - or, if you like, to be "stretched" - near the surface and thereby affecting the frequency and hence the wavelength of the light.)"

Incredible! I am so used to Einsteiniana's idiocies and yet.... Perhaps only Brian Greene, Einsteiniana's Showman, can produce greater idiocies:

http://query.nytimes.com/gst/fullpage.html?res=9A05EED81E3EF932A35752C0A9629C8B63
Brian Greene: "As we pass each other in the street, this rotation is imperceptibly tiny; that's why common experience fails to reveal the discrepancy between our respective senses of past, present and future. But just as a tiny angular shift will cause a rocket to miss a distant target by a large margin, the tiny angular shift between our notions of now results in a significant time discrepancy if our separation in space is substantial. If instead of being next to me, you were 10 light years away (and moving at about 9.5 miles an hour), what you consider to have happened just now on earth would include events that I'd experienced about four seconds later or earlier (depending on whether your motion was toward or away from earth). If you were 10 billion light years away, the time discrepancy would jump to about 141 years."

Pentcho Valev
pvalev@yahoo.com

 
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Re: Cornell University Explains Cosmological Redshift

August 9 2008, 6:39 PM 

Pentcho posts: *Cornell University: "In the case of distant objects where the expansion of the universe becomes an important factor, the redshift is referred to as the "cosmological redshift" and it is due to an entirely different effect. According to general relativity, the expansion of the universe does not consist of objects actually moving away from each other - rather, the space between these objects stretches. Any light moving through that space will also be stretched, and its wavelength will increase - i.e. be redshifted. (This is a special case of a more general phenomenon known as the "gravitational redshift" which describes how gravity's effect on spacetime changes the wavelength of light moving through that spacetime. The classic example of the gravitational redshift has been observed on the earth; if you shine a light up to a tower and measure its wavelength when it is received as compared to its wavelength when emitted, you find that the wavelength has increased, and this is due to the fact that the gravitational field of the earth is stronger the closer you get to its surface, causing time to pass slower - or, if you like, to be "stretched" - near the surface and thereby affecting the frequency and hence the wavelength of the light.)"*

Pentcho writes: *Incredible! I am so used to Einsteiniana's idiocies and yet.... Perhaps only Brian Greene, Einsteiniana's Showman, can produce greater idiocies:*

cinci: Pentcho, I'm shocked. All this time I thought you were a student of physics and you don't know these things? These ideas have been around for 50 years or more and you just heard them now? How can you critique theories that you so obviously don't know much about? This stuff is all old hat. Go learn some physics before you try to critique it. You're 50 years out of date.

 
 
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