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Politics : Formerly About Applied Materials -- Ignore unavailable to you. Want to Upgrade?

To: Martin Radwin who wrote (70709)	10/17/2003 5:15:45 AM
From: zonder	Respond to of 70976

Re CMBR - It is at a temperature of about 2.7 degrees Kelvin Yes. This is the temperature that was calculated as the bare minimum temperature the void would be in, given that there are also scattered points of intense heat, and their thermal radiation. Again, sorry, I don't have the exact terminology. What is so unusual about the CMBR is not only its black body spectrum but its extremely isotropic nature Yes. And I think this is one of the criticisms against Big Bang, that if the universe was created by the cooling down of a ball of intense heat into stars, then there should have been "bumps" in CMBR. I think recently they claimed to find these bumps, but even that was contested... Big bang theorists have argued that no other known mechanism other than the big bang itself could produce such an isotropic background I believe there are others that say that it could just be the degree to which galaxies here and there have managed to heat the void. That would also be an explanation of why it is so uniform. The most common explanation for the red shift is that it is based on the Doppler effect. When an object recedes from an observer, its frequency is red shifted proportionally to its speed of recession; when it moves toward an observer, its frequency is correspondingly blue shifted to higher values. Yes, and this works very well with photos of turning galaxies where you can see the blue and red in the sides that are turning towards and away from us. Like the CMBR, various alternative proposals have been made to explain the red shift. So far, none has really panned out either I recently read one that was explaining how a photon bends and accelerates as it passes near a large body of mass, hence contributing to its red shift. Not sure how sound the explanation is scientifically. If you're interested in exploring this further, there's a great web site with a bulletin board Thanks! :-)