gettinjiggywithit said:

I personally buy into the big bang stuff myself as it makes the most sense as of yet to me. I want to know where the stuff that caused it came from. Plank, Black radiation Oh Yea! Fun stuff! It's all interesting. Where did the stuff on the plank scale come from? Where did the black radiation come from.

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This all originated from the existence of blackbodies. We define a blackbody as one that absorbs energy and then radiates some of it out. It's called a blackbody because it absorbs wavelengths rather than, persay, a shiny object which reflects most of the light and absorbs some of it. A blackbody absorbs most of it, and a perfect blackbody absorbs ALL light and energy.

So the question was, at which wavelengths was the energy density for the blackbody the highest? That is where the Energy Density u(lambda) vs. lambda (see the graph near the bottom of this post) came from, and that is the curve you might be most familiar with. It was a mystery at first, and Rayleigh-Jeans did predict the curve at large wavelengths, but ended up with a term we call the ultraviolet catastrophe since his equation blew up to infinity as lambda (wavelength) approached zero. What Planck did, in his infamous equation, was make an equation that best fit the curve...

Oh, I should add that the curve was plotted FIRST, at high temperature blackbodies absorb lots of energy and light (say T = 1000?C) and as you may be familiar with, such blackbodies glow (like heating and iron up until its "red hot"). In particular, experiements were conducted by shooting light of different wavelengths at a blackbody and measuring the respective energy that was radiated. Planck made a plot that best fit this curve, and so it has become known as Planck's Law.

Now what does this all mean? Well, we can use Planck's Law in everyday life. You may have asked yourself, why does the sun appear yellow? Well, if you look at the curve of the plot of energy density vs. wavelength, as shown below



you see that at the peak, the highest energy is emitted. Conviniently, this plot also shows the visible spectrum (lambda = 400-700nm) and yellow is right dab at the tip of the curve for the temperature of the sun, which is approximately 5800K (5800 degrees Kelvin). As a result, at this wavelength (yellow) the most energy is emitted and that is why the sun is yellow. Similarly (say at T = 5000K, as shown in the graph), that "blackbody" would appear reddish since it's peak resides right at the red wavelength.

This relation to the Big Bang was explained in my previous post. I'm a bit fatigued right now so I'll explain it in depth later if you are interested.

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Does anyone question how stable the idea of evolution without creation is when it sits on a "theory"?

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If evolution built in our emotional body and ability to feel for others with a purpose for insuring survival of our species, if you think emotions are useless and override them with intellect, why? Might it be a lethal move for our species?

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