Being in “Space” vs. Being in “Orbit”, and Where Is the “Edge of Space”, Anyway?

[johnwalker]

The MASSIVE difference between orbit and sub-orbit

This is one of the clearest explanations of how an object achieves orbit and how maneuvers in space affect an orbit that I’ve seen. Plus, what’s the distinction, if any, among “weightlessness”, “zero gravity”, and “microgravity”?