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High Quality Content by WIKIPEDIA articles! A low Earth orbit (LEO) is generally defined as an orbit within the locus extending from the Earth s surface up to an altitude of 2,000 km. Given the rapid orbital decay of objects below approximately 200 km, the commonly accepted definition for LEO is between 160 - 2,000 km (100 - 1,240 miles) above the Earth's surface. With the exception of the lunar flights of the Apollo program, and the sub-orbital flights of the Mercury program, the aborted Soyuz 18a mission and the X-15 and SpaceShipOne rocket planes, all human spaceflights have been in LEO, including all Space Shuttle and space station missions. The altitude record for a human spaceflight in LEO was Gemini 11 with an apogee of 1,374.1 km.