sky we are seeing is only for earth or it is meant for whole universe?

Question

does earth have any upper cover called sky if so sky is transparent? does the sky common for the whole universe

Answer 1

The Earth's atmosphere is made up of molecules loosely connected as a form of matter called gas. Those molecules get thinner and thinner the farther away from the Earth's surface you go. At about 100 kilometers out (62 miles), there are not enough molecules to support the wing dynamics of aircraft and we call that "space". But, those atmospheric molecules continue for a long way out farther and we cannot say for sure exactly where the Earth's atmosphere technically ends. Space, between moons and planets and stars and meteors and other space debris is mostly a vacuum without many molecules of matter. Here is an image of the curvature of the Earth and our atmosphere taken from space:
http://www.kidsgeo.com/images/earths-atmosphere.jpg

Answer 2

Well let's just say OUR sky is for us, so by all means enjoy it.

There are many planets in the universe and they ALL have skies, because a sky is just what you see when you look up.

People used to think the 'sky' was a big blue blanket way up in the air, but it isn't. The sky is what the light from the universe looks like AFTER it gets through the air, plus whatever light is coming FROM the air.

On a dark night, when the air is clear, and the sky is black and filled with stars, you are pretty much looking at just the universe.

During the day, the sun lights up the air and you are pretty much looking at just the air.

If you were looking at the sky on the Moon, where there is almost no air, the sky would be very black and full of stars even during the day.

If you were looking at the sky on the planet Venus, where the air is very thick and full of clouds, you would never ever see the stars, not even at night.

The sky looks like it is very high. The stars are, but the air isn't.

If you could walk straight up, like you walk down the road, in one hour most of Earth's air would be below you, and it would be really hard to breath.

If you brought your own air so you could keep walking, you would be in space in less than a day, and if you walked fast you could get as high as the space shuttle flies.

From up there, the sky would look very black, like it does on the moon.

Answer 3

I read this question differently from the other answerers. I guess, as an astronomer, I think of "sky" as what we see of the universe when the Sun is below the horizon: planets, stars, star clusters, nebulae, galaxies.

In this context, our sky here on Earth is unique, and differs from the sky on Mars or Pluto, or a planet circling Alpha Centauri. Our sky has one large Moon, Mars' has two small ones. The sky from Alpha Centauri shows the stars in slightly different positions, and a second magnitude star in Cassiopaeia which isn't there in Earth's sky, the star we call "the Sun". My sky is a huge three dimensional space which you can move around in, and view from different perspectives.

A lot of this comes from using Starry Night software, which has this neat command "Go There". You can click on many objects in the sky, and be transported there to see the universe (my sky) from different perspectives.

Answer 4

The sky we see from Earth is viewed through Earth's upper atmosphere, which scatters the sun's rays, causing a blue colour. It is transparent, which is why you can often see the moon in the daytime. At night, when the sun is not there, the sky appears dark or completely black.

Answer 5

the blue sky you see is because the troposphere (the lowest level of the atmosphere) scatters blue light from the sun. The entire atmosphere of the Earth consists of several layers and slowly thins out as it approaches space. The atmosphere-space dividing line is at around 100km but parts of the atmosphere go much higher than that.

There is no atmosphere, hence no sky in space. If you look at the earth from space it looks like it has a thin, hazy blue line around it. That's the sky.

Answer 6

yeah the sky is common for the whole universe, if u were on the planet mars, u wud luk up and say "aaw luk at the sky'?
the earth has an upper cover called the atmosphere which is made up of many layers!
yeah the sky is transperant thats why we can the stars? isnt that obvious

Answer 7

Sky is the empty space we gaze at when there is no cloud cover. Space exists everywhere in the Universe.
The reason why we see a blue sky is because of atmosphere and the Raman effect. Out in space, the sky is jet black!!