International law defines the lower boundary of space as the lowest perigee attainable by an orbiting space vehicle, but does not specify an altitude.
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The number 100,000 is significant because it marks the altitude in meters where outer space begins, as delineated by the Kármán line established by the Fédération Aéronautique Internationale.
In January 2005, Bezos told the editor of the Van Horn Advocate that Blue Origin is developing a sub-orbital space vehicle that will take off and land vertically and carry three or more astronauts to the edge of space.