What a muddled explanation! Every essay I have read says the sky is blue because of refraction, not reflection. And the link http://www.why-is-the-sky-blue.org/ goes to a site that is for sale!"The blue regions shine primarily by reflected light. Blue light from the star Rho Ophiuchi and nearby stars reflects more efficiently off this portion of the nebula than red light. The Earth's daytime sky appears blue for the same reason."
http://antwrp.gsfc.nasa.gov/apod/ap070903.html
Why is the sky blue? (APOD 03 Sep 2007)
Why is the sky blue? (APOD 03 Sep 2007)
I'm almost famous!
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Re: Why is the sky blue?
Spammer! Mods please note!
Don't click on any of the links on that website!
Don't click on any of the links on that website!
Regards,
Andy.
Andy.
The process is called Raleigh scattering. The molecules that make up the atmosphere are approximately the same scale as the wavelength of blue light, so it scatters blue light more efficiently than other colours. Thus, the sky (and reflection nebulae) appear blue.
Don't just stand there, get that other dog!
Re: Why is the sky blue?
Not only an old link, the APOD is practically the same as the one for June 2, 2004.NoelC wrote:I suspect [they] reused an old link
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- Location: Oakworth, Yorkshire, England
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SmartAZ wrote:Excuse me? Did I say something I shouldn't?
Hmmmm.... Sorry about that, it's just that I saw what was your first post on here with a link to another website that had advertising on it and I put two and two together and came up with spam. That's a pattern I've seen before many times and the links from some of these websites just load up spyware on your computer. No offence intended.
Can't be too careful out there.
![Smile :)](./images/smilies/icon_smile.gif)
Regards,
Andy.
Andy.
It is my understanding that the light from reflection nebula is light reflected from nearby stars. The color of reflection nebula is caused by Raleigh scattering (refraction) in the same way our skies are colored blue. Emission nebula create their own light, mostly excited H-alpha ions which have a distinctly red glow.
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk. — Garrison Keillor
alive to the gentle breeze of communication, and please stop being such a jerk. — Garrison Keillor