Difference between revisions of "Cosmic microwave background"

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'''{{PAGENAME}}''' (CMB) radiation describes the [[electromagnetic wave]]s that propagate through our entire universe. It is thought to be left over radiation from the [[big bang]], namely the radiation scattering off of the opaque, dense plasma of the early universe just before the transition to the transparent universe we observe today.  This transition, called "last scattering", is believed to have occurred approximately 380,000 years after the big bang.
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A place where nobody dared to go
 +
The love that we came to know
 +
They call it Xanadu
  
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One interesting feature of the CMB is that it provides a rest frame against which one can measure the motion of galaxies and other astronomical objects. Since the cosmic microwave background is made of electromagnetic waves, a moving observer will observe a [[Doppler shift]] of the cosmic microwave background, whereas a stationary observer will not. Since the frequency of the cosmic microwave background is known (160.2 GHz <ref name="physorg">http://www.physorg.com/tags/cosmic+microwave+background/</ref>), the velocity of the observer can easily be calculated. Our very Earth sees a Doppler shift in the cosmic microwave background, a shift that must be subtracted from measurements of the CMB to obtain its true temperature distribution.
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And now
 +
Open your eyes and see
 +
What we have made is real
 +
We are in Xanadu
  
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The thermal black-body spectrum of the cosmic microwave background is 2.725 K. <ref name="physorg" />
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A million lights are dancing
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And there you are
 +
A shooting star
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An everlasting world
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And you're here with me
 +
Eternally
  
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==Notes==
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Xanadu, Xanadu,
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<references/>
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(now we are here)
 +
In Xanadu
 +
Xanadu, Xanadu,
 +
(now we are here)
 +
In Xanadu
  
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[[Category: Physics]]
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Xanadu, your neon lights will shine
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[[Category: Astronomy]]
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For you, Xanadu
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[[Category: Cosmology]]
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 +
The love
 +
The echoes of long ago
 +
You needed the world to know
 +
They are in Xanadu
 +
 
 +
The dream
 +
That came through a million years
 +
That lived on through all the tears
 +
It came to Xanadu
 +
 
 +
A million lights are dancing
 +
And there you are
 +
A shooting star
 +
An everlasting world
 +
And you're here with me
 +
Eternally
 +
 
 +
Xanadu, Xanadu,
 +
(now we are here)
 +
In Xanadu
 +
Xanadu, Xanadu,
 +
(now we are here)
 +
In Xanadu
 +
 
 +
Now that I'm here
 +
Now that you're near in Xanadu
 +
Now that I'm here
 +
Now that you're near in Xanadu
 +
Xanadu...

Revision as of 01:02, August 10, 2010

A place where nobody dared to go The love that we came to know They call it Xanadu

And now Open your eyes and see What we have made is real We are in Xanadu

A million lights are dancing And there you are A shooting star An everlasting world And you're here with me Eternally

Xanadu, Xanadu, (now we are here) In Xanadu Xanadu, Xanadu, (now we are here) In Xanadu

Xanadu, your neon lights will shine For you, Xanadu

The love The echoes of long ago You needed the world to know They are in Xanadu

The dream That came through a million years That lived on through all the tears It came to Xanadu

A million lights are dancing And there you are A shooting star An everlasting world And you're here with me Eternally

Xanadu, Xanadu, (now we are here) In Xanadu Xanadu, Xanadu, (now we are here) In Xanadu

Now that I'm here Now that you're near in Xanadu Now that I'm here Now that you're near in Xanadu Xanadu...

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