Orbital decay
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Orbital decay is the reduction in the height of an object's orbit over time due to the drag of the atmosphere on the object. This drag increases during periods of high solar activity (sunspot), due to more frequent collisions between the object and surrounding air molecules. So the more solar activity, the more drag; the more drag the slower it gets; the slower it gets the more it falls, until it hits the atmosphere and burns up. During solar maxima (the time of a sunspot), the Earth's atmosphere causes drag up to a hundred kilometers higher than during solar minimums.