According to Wikipedia (footnotes and links omitted), a low Earth orbit (LEO) is an orbit around Earth with a period of 128 minutes or less (making at least 11.25 orbits per day) and an eccentricity less than 0.25. Most of the artificial objects in outer space are in LEO, with an altitude never more than about one-third of the radius of Earth (or about 20000 kilometers). See here: https://en.wikipedia.org/wiki/Low_Earth_orbit
See also: https://archive.ph/9CzdJ
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prior probability 