What are the properties that make up zero gravity outer space?

There is no zero gravity in space. As long as there's matter in the universe there will be gravity. The feeling of wieghtlessness is caused because the astronauts are ';falling'; back to earth at the same rate as the ship. You'd experience the same thing if you were in a elevator that suddenly started falling.What are the properties that make up zero gravity outer space?
';Zero gravity'; is a relative term and a local condition.





When the astronauts are floating around in the International Space Station, they are still affected by gravity. In fact, if you check Newton's equation for gravitational force,


F = G M m / d^2


you find that Earth gravity is still over 90% of what it is on Earth's surface.





What the astronauts feel is the absence of weight. The reason is that they are in free fall, along with the space station.





On Earth's surface, you are attracted by Earth's gravity and your body wants to fall towards Earth's centre. but the ground is in the way and is not moving. So it pushes back up on you and you feel this pressure as ';weight';.





If you were to step into an elevator and the cable were to snap, the elevator would start falling towards Earth's centre at the same rate as you would fall. Therefore, the elevator floor is no longer pushing up on your feet and you feel weightless. You'd be able to float around the elevator and enjoy the feeling... if it were not for the panic.


The ';enjoyment'; would cease when the elevator arrived at the basement.





The astronauts in the space station are falling, and the space station is falling at exactly the same rate. Because of the sideways movement (orbital speed), they will never reach the ground as they keep missing the Earth (the sideways speed makes them miss).





So they fall (proving gravity still exists). Nothing is pushing back on them (not the floor, not the walls) so they do not feel weight.





In order to keep their sanity and their physical shape, they need to feel some kind of ';weight'; so they fool their body by tying bungee cords to their belts, and tying the cords to the ';floor';. The cord pulls them towards the floor and they have to ';push'; back with their legs; this pressure gives them the feeling of weight.What are the properties that make up zero gravity outer space?
in some regions of space, the gravitational field intensity due to several nearby bodies (Sun, Moon %26amp; Earth) oppose and neutralize resulting in the absence (null) gravity there. That is all there is to it.
The properties of zero gravity are that an object will not experience acceleration due to gravitational forces.
A lack of localized differential acceleration.





Doug