Re: [Phys-l] Cosmic background radiation

[Jack Uretsky <jlu@hep.anl.gov>]

Hi Leanna-
Michael Porter's suggested website gives a nice summary.  The point to be 
emphasized is that you have to be careful with the language.  The 
background radiation was predicted as a consequence of the big ban, then 
it was found.  If the background radiation had been found before it was 
predicted, folks might have found other explanations for it.

Also, you need to remember that different parts of the universe are at 
different times - when we look at distant objects we are ``looking back'' 
in time.  The background radiation is (actually, was) hotter at earlier 
times, so it is a bit misleading to say that it is "constant" throughout 
the universe.
					Regards,
						Jack



On Sun, 5 Nov 2006, Aker, Leanna wrote:

> Hi folks!
>
> I teach 9th grade physical science.  We are getting ready to discuss
> the Big Bang Theory and I was wondering if someone could explain
> to me just how the cosmic background radiation is supporting evidence? 
> I know that the fact it is constant throughout the universe is the key, 
> but I'm foggy on just how this provides supporting evidence for the Big 
> Bang.
>
> Thanks!  (I have great lab activities showing red shift, etc.)
>
>
> Leanna B. Aker
> Science Teacher
> Columbia Junior High School
> 253-517-1600 X27210
> laker@fife.k12.wa.us
> http://www.fifeschools.com/cjh/staff/laker/index.htm
>
>
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