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When we lift our heads to the night sky, we encounter a dark void. Aside from a few twinkling stars, and if we are lucky, a planet or perhaps a satellite, there is vast darkness. At first glance, the reason for this seems simple: sunlight does not reach the side of Earth facing away from the Sun, so the sky appears dark. But the truth is far deeper and more thought-provoking. This question—“Why is the night sky dark?”—has occupied curious minds and scientists for centuries. This mystery is known