From the International Space Station the crew photographed a sunset seen over western South America. The station crew sees, on average, sixteen sunrises and sunsets during a 24-hour orbital period. Each changeover between day and night on the ground is marked bythe terminator, or line separating the sunlight side of Earth from the side in darkness. While the terminator is conceptualized as a hard boundary-and is frequently presented as a such in graphics and vishualizations-In reality the boundary between light and dark is diffuse die to scatering of light by Earth's atmosphere.
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