It is an interesting read. Do Flat Earthers have no room for gray area?
"This definition is accepted by the Fédération Aéronautique Internationale (FAI)."
"Although the United States does not officially define a boundary of space, the U.S. definition of an astronaut, which is still held today, is a person who has flown more than 50 miles (~80 km) above mean sea level. (This is approximately the line between the mesosphere and the thermosphere.) This definition of an astronaut had been somewhat controversial, due to differing definitions between the United States military and NASA.[8]"
"International law defines the lower boundary of space as the lowest perigee attainable by an orbiting space vehicle, but does not specify an altitude. Due to atmospheric drag, the lowest altitude at which an object in a circular orbit can complete at least one full revolution without propulsion is approximately 150 km (93 mi), while an object can maintain an elliptical orbit with perigee as low as 129 km (80 mi) with propulsion. [10]"
Do you see what I'm trying to say? There's still drag above 100 km... they chose an arbitrary distance to call the edge. It's not a natural law or anything.