Low Earth orbit represents the closest region of space to Earth's surface, serving as the operational domain for the International Space Station, the Hubble Space Telescope, and thousands of active satellites. The region generally spans from 160 kilometers (100 miles) to 2,000 kilometers (1,200 miles) above mean sea level.
Low Earth Orbit Below 160 Kilometers: The Atmospheric Drag Challenge
Below 160 kilometers, atmospheric drag becomes so significant that a spacecraft would require prohibitively large amounts of fuel to maintain orbit, effectively making it a suborbital trajectory rather than a sustained orbit. 6 degrees, which allows the ground track to pass over populated areas of the Northern Hemisphere.
Atmospheric Density and Orbital Decay Even within the defined upper range, trace atmospheric molecules exist, creating a minuscule drag force that gradually slows a satellite's momentum. The upper limit of 2,000 kilometers is not a strict physical barrier but a practical demarcation where the influence of Earth’s magnetosphere begins to interact more strongly with the space environment, and where orbital perturbations from the Moon and Sun become more pronounced.
Low Earth Orbit Below 160 Kilometers: The Atmospheric Drag Challenge
Advantages of the Low Earth Zone The proximity of low Earth orbit to the planet provides significant advantages that are unattainable from higher orbits. This high velocity is the defining characteristic that separates orbital mechanics from suborbital flight, which follows a ballistic arc and returns to Earth within minutes.
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