Why isn’t the sky bright at night?

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There are trillions of starts all over the sky up to the infinite edge of the universe, but why they don’t adds up and make night sky as bright as white space. We might not need infinite stars to make the background white, imagine a white user desktop in your personal computer. It takes small number of white pixels compare to the stars that we have in our observable universe.
I get this question quite often by my VideoKatha friends and thought of finding the reason and explain that to my audience in general terms. Please check the above video so you will find the answer to the question.