nincompoop
  • nincompoop
why is the night sky dark?
Physics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
well.. you should really look at "why is the night sky dark from minutephysics" video . that ll give you aminute explanation of it ;-)
anonymous
  • anonymous
Because it's facing away from the sun. Unfortunately, the sky isn't dark enough. Since the invention of power transmission and artificial lighting, light pollution has spoiled the darkness with a constant foggy haze, and we are now denied the simple glory of dark skies at night. And it just keeps getting worse.
UnkleRhaukus
  • UnkleRhaukus
not as much light around

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nincompoop
  • nincompoop
interesting answer from minutephysics, @mashy While a few things are on point like the scattering that gives the answer why the sky is blue or whatever, I just don't think the answer was sufficient or it is my inability to completely understand the answer it gave. Or perhaps it is because the explanation was dumbed down too much for my taste.
anonymous
  • anonymous
The reason anything is dark or black is that it is neither emitting, reflecting or scattering light in your direction.
anonymous
  • anonymous
The question is .. why is the night sky dark?? because there are billions and billions of stars everywhere.. so why is it dark? regardless of whether we had sun or not.. atmosphere or not.. it shouldn't have been dark the answer what minutephysics gives is this Even though there are many starts.. some are so far, that light hasn't had enough time to reach us yet.. from the beginning of the big bang.. and secondly universe is accelerating.. which means red shift takes place.. starts which are very far away are going away from us faster.. and hence get red shifted more.. and goes into the infrared region.. ! i seriously do believe its the second reason.. ! cause if you use an infrared cam.. you can always detect radiations.. strong radiations everywhere! all the tiem!
anonymous
  • anonymous
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ghazi
  • ghazi
a simple explanation is , anything that we can see is because of light reflect from that object, like when you are in a dark room you cant see anything because none of the object receives light therefore no reflection similarly at night there is no light so there is no reflection and hence it appears dark |dw:1362242947537:dw|
.Sam.
  • .Sam.
http://www.youtube.com/watch?v=gxJ4M7tyLRE
anonymous
  • anonymous
@ghazi that is only if the object is NOT self luminous.. billions of star around us all are self luminous :O :O !!
ghazi
  • ghazi
@Mashy stars are releasing light so point to be noted that , eyes can form image ONLY if light is there , hope you know that stars emit light :D and try to understand what i have written :D
anonymous
  • anonymous
i have no clue what you just mean't ghazi :O
nincompoop
  • nincompoop
How do we get around the fact that we are able to observe stars mean that the lights have reached us, and or what will happen when finally the lights "reach" us would this mean that there will be just day and not night and day? is there not enough light intensity or the r^2 in the equation may be the reason that the night remains dark?
anonymous
  • anonymous
The reason is.. you can't see ALL THE STARTS which are present.. thats why you have gaps between bright shinning spots.. about when finally the light reach us?.. i really have no clue.. because the time we are talking about here is something in millions of years.. so.. why care? lol :D
nincompoop
  • nincompoop
If you refer the gaps in shining spots to be the "twinkle" that stars do, that is due to the earth's atmosphere. Stars do not twinkle if observed from the outer space.
ghazi
  • ghazi
stars twinkle due to refraction of light and that is due to particles present in atmosphere :) now if the intensity of light diminishes till it reaches to our eye then its very obvious that we cant see, we can see anything only if light is there
nincompoop
  • nincompoop
I have a feeling that the intensity of light diminishing may be tied to Olber's Paradox. We have to explain what are is the reason behind it.
anonymous
  • anonymous
No no.. i didn't mean the gaps to be that.. i mean't the gaps to be the darkness that we see in between bright spots ! who's talking about twinlkling here ? :-/
anonymous
  • anonymous
You bumped but what are you trying to ask now?
anonymous
  • anonymous
Haven't bothered to read all of the about. But the sky is dark simply due to the absence of light.
anonymous
  • anonymous
@sigex what he is saying is why is there absence of light? there are stars EVERYWHERE ... there are so many stars.. that every direction you look there must be alteast one star.. so why is it still dark!
ghazi
  • ghazi
i explained that, we can see anything only IF LIGHT IS REFLECTED BACK now if there are billions or trillions of light source is out there in space , still if it has got nothing to bounce back , we cant see anything so there must be something in space so that you can see it , but unfortunately there is nothing in space to reflect the light so its DARK, hope its clear to you @nincompoop

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