Low-Earth Orbit is the region of space around the Earth below an altitude of 2,000 kilometres. It is the easiest orbit to get to and stay in. This is where the Shuttle and ISS conduct their operations. One complete orbit in LEO takes about 90 minutes.

"There are all kinds of interesting questions that come from a knowledge of science, which only adds to the excitement and mystery and awe of a flower."
Richard Feynman
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