Transcript for scene 9 of the video " Big Bang Blow-Out 1: Entropy versus Anti-entropy" by Rolf Witzsche  

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When we measure red shift

What do we measure when we measure red shift? 

It has been theorized that when a source of light is moving away from an observer, the light-waves are stretched out, which causes the observer to perceive the light shifted towards longer wavelengths: towards the red of the visible spectrum. 

Inversely, it has been theorized that when a light source is fast approaching an observer, the light is compressed by the movement towards shorter wavelengths, which is deemed to cause a shift to occur, towards the blue. 

The shifting itself is observed in the shifting absorption lines in the light spectrum. The individual lines are caused by specific colors of light being absorbed by specific atomic elements in the path of the light. The resulting absorption pattern is known to be essentially uniform among the galaxies, only the observed shifting of the pattern varies. From the amount of the shifting, and from the resulting calculated expansion speed of the most distant galaxys, it has been theorized that the Big Bang creation event occurred 13.8 billion years ago. But is the theory true? Can it be true?

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche