The Planets: Photographs from the Archives of NASA

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Ashley We don't feel motion on earth because its speed is constant, as in, we'd only feel it if it sped up or slowed down. Think of being in a car. We don't …moreWe don't feel motion on earth because its speed is constant, as in, we'd only feel it if it sped up or slowed down. Think of being in a car. We don't feel the curve because it's very gradual compared to taking a curve in a car. Those star trail photographs show stars traveling in arcs, not perfect circles.(less)

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