OK, so I work for an organization that deals with "space" 24/7 and controls satellites. We had a discussion today on whether INNER/OUTER SPACE starts at 100Km above the Earth or where the atmosphere becomes a complete vacuum. NASA says 50 miles...ect... My opinion is that Inner Space can be defined where the gravitational pull of the Earth reaches and Outer Space is where the gravitational pull diminishes. Some argued this point with "Our Solar System is acted upon gravitational pull by the Sun, the Milky way Galaxy and even the Universe." So where does it begin/end? Can this even be defined? Again...this seems to be a "your opinion" answerable question so...what is it?