Olbers paradox

    Why is it dark at night?

It's a silly question. As the sun is absence it appears dark.

But it not right.....

In the morning sunlight scatters the atmosphere. So, it appears blue. If there is no atmosphere like on the moon, it appears dark, even the sun shines.

So, why the space dark?

It's full of stars, galaxies. No matter what direction you picked, you will find a star or galaxy. But actually, space is not dark...
But why it appears to be dark at night?
Hubble space telescope-HST took the images of the universe with an infrared camera.

Why??

Because distant stars and galaxies are moving away from us causing frequency shift more and more(due to expansion of the universe), the Doppler effect causes redder which are moving away from us, and it goes on to infrared. Thus we cant see them.
German astronomer "Heinrich Wilhelm older" made an incredible paradox widely known as the "dark night sky paradox".

This specifies two issues about darkness.

1. The universe is expanding.
So, light from the distant stars is 'red-shifted' to obscurity.

2. The universe is young.
Light from distant stars hasn't even reached us yet.

This is the reason behind the dark in the night.

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