Why is it Dark at Night?

Почему небо ночью тёмное? Здесь тоже субтитры Have you ever wondered why you look up and see a dark sky at night? Help share science with the world: Subscribe to MinutePhysics! MinutePhysics is on Google - And facebook - And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in