My friend and I are using weather balloons and a rocket to send a camera into space. We need to know how far from earth we must be to not have the camera fall back. The edge of the atmosphere is around 13km and we can easily get past that. We have 2 weather balloons with a 100,000 ft breaking point and a pressure equalizing mechanism. We will have a small rocket launch just before the balloons break and possibly have it stay in space.