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What Is the Average Color of the Universe?

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Re: What Is the Average Color of the Universe?

#5
edit: oops. My apologies, sodium is responsible for the dark band at ~5,890 I misread a graphic. Still looking into the spike...

If like me you just had to know what was responsible for the huge spike in the red (@ wavelength of about 6600 angstroms)....

Sodium.

Tangentially related (TIL) sodium also effects a star's end-of-life cycle: http://news.nationalgeographic.com/news/2013/05/130529-how-s...

Re: What Is the Average Color of the Universe?

#6

I know that they were trying to find the average wavelengths of visible light, and I loathe pedantry, but shouldn't the answer be "black"?

In this context black is the absence of light, so it's disqualified right off the bat.

With a clear night and a good telescope there are a lot of stars out there. So I would say even the average color of the night sky looking out from earth wouldn't be black. http://apod.nasa.gov/apod/ap150101.html

Re: What Is the Average Color of the Universe?

#7
It's just an arbitrary wavelength. It's not that the universe is emitting a boring color, it's the fact that we interpret this color as beige and therefore boring.

The interesting thing we should be asking is why does our biology cause us to notice high wave lengths like red and find colors like beige to be really plain and boring.

Re: What Is the Average Color of the Universe?

#8
post #5

edit: oops. My apologies, sodium is responsible for the dark band at ~5,890 I misread a graphic. Still looking into the spike... If like me you just had to know what was responsible for the huge spike in the red (@ wavelength of about 6600 angstroms).... Sodium. Tangentially related (TIL) sodium also effects a star's end-of-life cycle: http://news.nationalgeographic.com/news/2013/05/130529-how-s...

In the spectrum graph (near the bottom) there are ¿two? light band at 4500-4600A but there is no spike in the graphic. All the other light bands have spikes and all the dark bands have valleys. Do you know what happened there?

Re: What Is the Average Color of the Universe?

#10
post #6

I know that they were trying to find the average wavelengths of visible light, and I loathe pedantry, but shouldn't the answer be "black"?

In this context black is the absence of light, so it's disqualified right off the bat. With a clear night and a good telescope there are a lot of stars out there. So I would say even the average color of the night sky looking out from earth wouldn't be black. http://apod.nasa.gov/apod/ap150101.html

I couldn't resist curiosity and had to analyze that apod image just to see...

  Average Color (rgb): 62, 45, 51
  Average Color (hex): #3E2D33 
  Average Color (visual): http://i.imgur.com/xDBeHqu.png

  Source: http://pastebin.com/vckL3AP6
  Credit: http://charlesmartinreid.com/wordpress/2012/08/python-image-averaging-and-color-averaging/ (with some cleanup)
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