An interesting Text Art News Article about the Anatomy of Type, Basics and some Effects. I'm sure you'll learn from it!
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~SpikeValance
Aug 10, 2007, 11:06:51 AM
Aug 10, 2007, 11:06:51 AM
I have a question: I think worlds around M-dwarf stars, even if habitable, could not be suitable for Human settle, because of too low content in UV rays humans need in Calcium-phosphate metabolism. I think they could suffer rachitism after living 2 years on such worlds. Do you agree or do you think such worlds could be suitable instead?
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So... Is that with or without the Doppler's effect? 
Not that I know much on the Astrology side of things. I've always loved physics in high school, especially astronomy but I was always better at the theory than the maths 
--
"Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity" ~Einstein
*Wicked-LandScapes Have you been wicked?
Not that I know much on the Astrology side of things. I've always loved physics in high school, especially astronomy but I was always better at the theory than the maths --
"Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity" ~Einstein
*Wicked-LandScapes Have you been wicked?
No Doppler effect here... this is for stars which aren't moving relative to the observer (and in any case, it'd have to be moving pretty fast for you to notice a difference).
Besides, if you Doppler shift a blackbody spectrum you just get the colour shifted to a different temperature (hotter apparent temperature if it is moving towards you, cooler if it is moving away).
Besides, if you Doppler shift a blackbody spectrum you just get the colour shifted to a different temperature (hotter apparent temperature if it is moving towards you, cooler if it is moving away).
Wow. This is an awesome job! 
Thanks, thought you'd like it. 
I have a question: I think worlds around M-dwarf stars, even if habitable, could not be suitable for Human settle, because of too low content in UV rays humans need in Calcium-phosphate metabolism. I think they could suffer rachitism after living 2 years on such worlds. Do you agree or do you think such worlds could be suitable instead?
My view is that the number of worlds in the galaxy which humans could live on without needing massive engineering projects to make the environment survivable is one. Unfortunately it seems we've got a massive engineering project running on it to make its climate rather less suitable for us.
As for whether low ultraviolet levels on red dwarfs would be a problem, I don't know. Less ultraviolet means less ozone production in the atmosphere, which means a greater proportion of ultraviolet gets through. The health risks/benefits of flarebathing are another issue you'd have to think through.
As for whether low ultraviolet levels on red dwarfs would be a problem, I don't know. Less ultraviolet means less ozone production in the atmosphere, which means a greater proportion of ultraviolet gets through. The health risks/benefits of flarebathing are another issue you'd have to think through.
So you think instead M-dwarfs emit more UV-rays due to the absence of Ozone layer (and assuming flaring event)?
Anyway they're few habitable in the end
Anyway they're few habitable in the end
Not qute: the ozone would be in the planet's atmosphere, not the star's (should have made that more clear). So while the red dwarf emits less UV, the planet's surface would get a greater proportion of that UV than the Earth's surface gets of the Sun's UV. Whether that would get UV levels on a red dwarf planet up to values comparable to Earth's surface is another matter.
Yes, I know ozone layer is on planet's surface. So more UV rays than on Earth, isn't it?
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