Why is the sky blue ?
Because of the Air
Because it's high
Because, I don't know
Because, every Sky is Blue
I don't know
I don't know why
When you look up at the sky,
do you every wonder, why is the sky blue?
I'm sure just like me
many of you think, that it has something to you
with the colour of water in the oceans and
seas around us
A play of light, reflecting of the blue colour of water below,
which make the sky appear blue
But, if that were true,
then what would happen if we were surrounded by land
and no water at all
The colour of the sky would then be green,
isn't it?
Because of the land and trees below
But, have you ever seen a green sky?
Wherever you may have travelled on earth
the sky is always blue
That means there must be something else
that makes the sky blue. Lets find out...
Scientist and engineers have managed to send
spacecrafts from earth to the moon and other planets
Lets have a look at what the sky look outside earth
This is a real picture taken by astronauts
when they visited the moon
Did you notice that the sky was dark,
just like outer space
Here's what the sky look like on Mars
its yellowish in colour
So the sky on Moon, Mars and Earth
all look very different
Earth's sky is made up of lots and lots of air
It's the same air we breath
When astronauts went from earth to the Moon
they discovered that there isn't any air on the Moon
and this is why the sky on Moon doesn't have any colour
It just looks dark like outer space
On earth the air we breath
is made up of gases called oxygen and nitrogen
So when the sun shines on these gases
the air appears blue
On Mars scientists have confirmed that there is air
unlike the Moon, but its different to Earth's air
because its made up of another gas called
carbon dioxide
Which is why when sunlight shines on carbon dioxide
it makes the sky on Mars seem yellowish
So now, we know that it's the air on Earth
that makes our sky blue
But hold on, look around you
do you think the air around you is blue in color
it isn't, right?
It's transparent and see through isn't it?
Here is the tricky part, so listen very carefully
When you look up at the sky
you are seeing lots and lots of air together
But when you look around yourself
you are only seeing a little bit of air
Let me give you an example to make this easier to understand
Look at this glass of water
It's transparent, right?
But, when you look at the water in a swimming pool
or an ocean, it looks blue, isn't it?
That's because there is lots and lots of water together
So to sum it up, the air around us might look transparent
but thats only because, we are looking at
a little bit of it
but, when you look up at the sky
you are looking at lots of air together
which is why our sky appears to be blue
I hope you found this interesting
see you next time
until then stay curious
Bye
