When NASA speaks of weightlessness and microgravity, physics calls the same phenomenon:

1. The everyday word weightlessness suggests gravity has vanished, which it has not. 2. The scientific definition of weight differs dramatically from the definition used by NASA and the popular media in relation to space travel. 3. When they speak of weightlessness and microgravity, they are really referring to the phenomenon physics calls free-fall. 4. In free-fall everything accelerates together, so nothing presses against anything else. 5. The gravitational field is still very much present in low Earth orbit. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_