On 8/31/2014 3:51 PM, Monroe L. King Jr. wrote:
The FAI is also the governing body I'd submit an altitude or speed record attempt too if I wanted an official record.
As others have said, this (the 100 km altitude) seems to have a lot of backing among the space community. For myself, I'm more interested in the altitude Monroe mentioned earlier (minimum altitude for a viable orbit, though I'm not really sure where that is, since I'm sure it varies; 100 statute miles is a nice round number, though I know satellites do dip into lower orbits, at least at perigee). Really space is a concept rather than a physical boundary, and it's the effects (e.g. loss of aerodynamic control, need for pressure suit, "low enough" atmospheric density) one has to worry about. Any of the definitions being bandied around can (arguably) be used. I personally do not like hearing reports that a balloon has flown to (near-)space but that's personal feelings.