英语翻译SkyWhat is the sky?Where is it?How high is it?What lies

英语翻译
Sky
What is the sky?Where is it?How high is it?What lies a-
bove it?They are too difficult to answer,aren't they?
Is the sky blue?In fact,the sky has no color.Is the sky filled
with air?We know that there is air round the world.Planes can' t
fly without air because they need air to lift their wings.Planes
cannot fly very high because when they go higher,the air gets
thinner.If we go far enough away from the earth.We find there is
no air.
Perhaps we can answer some of our questions now.What is
the sky?Nothing.Where is it?It is all around the world.The sky
is space.In this space there is nothing but the sun,the moon and all
the other stars.
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