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The Earth's night sky



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The Earth's night sky
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The photo shows the night sky over Halle, Germany, in winter, looking south. If we lived in an infinite Universe that was filled evenly with stars or galaxies, then in every direction we would sooner or later catch a glimpse of a star – the night sky would have to shine as brightly as the surface of the Sun.

Credit: Contactni (CC-BY-SA 2.0).