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===Uncontrolled reentry===
More than 100 metric tons of man-made objects reenter in an uncontrolled fashion each year. The vast majority burn up before reaching earth's surface. On average, about one cataloged object reenters per day. Approximately, one-fourth of all objects are of U.S. origin. Due to the Earth's surface being primarily water, most objects that survive re-entry land in one of the world's oceans.
==See also==
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