Yeah I have heard all that before, sort of like gravity itself. We know it exist, we feel it yet we can’t see it.We say it does have an effect on the moon yet our astronauts are totally weightless in the ISS and they are a lot closer.I just don’t have the analytical mind to grasp it even though I accept it.
Astronauts are weightless in orbit because they, and their ship, are both in continuous free-fall. They aren’t outside earth’s gravitational field; earth’s gravitational field is what keeps them in orbit instead of flying away into space.
Actually, the astronauts are not 'weightless'; it only appears that way when, in fact, they are 'falling' around the earth due to gravity.
Being “in orbit” means perfectly balancing the speed at which something is falling so that it remains at a constant altitude (depending on the type of orbit...). Any faster and you fly off into space. Any slower and you fall to the Earth. You are subject to earth’s gravity and are always falling....but you are going so fast that you miss the earth (constantly).