Why the sky is blue:
- Thread starter Amicus Dei of [FoG]
- Start date
its the light reflecting off hydrogen and oxygen in the atmosphere. nuff said
Snakebite7
New Member
You just said the same exact thing you said in his thread.
yes but mine was 1 sentence long lol
vibrokatana
New Member
The sky is really a bright red, oh wait I was sleeping with my eyes toward the light.
Ember
Mrs. Tek7
Rayleigh scatter!
There, I said it in two words.
An aside: the whitish glare around the sun is due to Mie scatter.
There, I said it in two words.
An aside: the whitish glare around the sun is due to Mie scatter.
![Amicus Dei of [FoG]](/forums/data/avatars/m/2/2239.jpg?1442680077){kind=avatar}
Amicus Dei of [FoG]
New Member
next phenomenon: staring at bright lights (namely the sun) for a long time leads to large blue/purple spots covering the light from view... also if you close your eyes after this blue/purple shading has covered the light it turns yellow, and upon reopening your eyes it returns to blue or purple... and so on. Then it eventually fades away and you can see normally again...
Why?
and yes i can stare at the sun most of the time (there are days when it's too bright for that though)... and it doesn't hurt (it might be slowly reducing my vision but it doesn't cause pain if it's not a too-bright day..
Why?
and yes i can stare at the sun most of the time (there are days when it's too bright for that though)... and it doesn't hurt (it might be slowly reducing my vision but it doesn't cause pain if it's not a too-bright day..
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Ember
Mrs. Tek7
Okay I have an educated guess about part of your question, but I will have to think about the rest.
When you look directly at something, you are using the part of the retina called your macula. It has excellent visual acuity because there are a LOT of cells right there.
Overall, your retina has 4 kinds of photoreceptors (the cells that perceive light). Rods and 3 kinds of cones. There are red cones, green cones, and blue cones.
The macula has NO blue cones...it does not perceive blue. You still see blue in the things you look at because your brain fills it in.
Okay, so when you look at a light for a long time you "bleach" your retina. You max out those cells for a while and it takes about 5 minutes I think for them to completely regenerate.
Since there are no blue cones in your macula to bleach, you can still see blue when your eyes are open and looking around.
I don't know about the eyes closed part. I have ideas floating in my head but they're more or less incomplete and incoherent. ^^;;
When you look directly at something, you are using the part of the retina called your macula. It has excellent visual acuity because there are a LOT of cells right there.
Overall, your retina has 4 kinds of photoreceptors (the cells that perceive light). Rods and 3 kinds of cones. There are red cones, green cones, and blue cones.
The macula has NO blue cones...it does not perceive blue. You still see blue in the things you look at because your brain fills it in.
Okay, so when you look at a light for a long time you "bleach" your retina. You max out those cells for a while and it takes about 5 minutes I think for them to completely regenerate.
Since there are no blue cones in your macula to bleach, you can still see blue when your eyes are open and looking around.
I don't know about the eyes closed part. I have ideas floating in my head but they're more or less incomplete and incoherent. ^^;;
Lazarus
New Member
You look at the sun and you'll get cataracts. That's what my Dad says and he's an optometrist that sees hundreds of people with cataracts.
I think he knows what he's talking about.
I think he knows what he's talking about.
Ember
Mrs. Tek7
Yay, I didn't know that, Lazarus. That's what I'm studying to be (I don't know if most people know that around here?).
You also don't want macular degeneration.
You also don't want macular degeneration.
This thread proves what I've been saying for years now:
My wife is smarter than I am.
My wife is smarter than I am.
Ember
Mrs. Tek7
Pfft, I could be totally wrong! I'm just a nerd hypothesizing.
Tek's super smart <3!
Plus it's not every day that I find threads here that pertain to what I do all the time.
Tek's super smart <3!
Plus it's not every day that I find threads here that pertain to what I do all the time.
Or at least I used to be, before I earned my Bachelor's Degree. I think my brain has atrophied in the year since.
True.Plus it's not every day that I find threads here that pertain to what I do all the time.
Maybe we need more threads on science to get more nerdy women to post on the forums.
