Question for Scientists and Physicists Regarding Gravity?

Question

Why do we as a society confuse our people by allowing our astronauts to refer to outer space as zero gravity, when it in fact is only a reduced Gravity state of existence.

As I see it, with all of the billions upon billions of dollars which we have spent in Astronomical Space research, we must now know for a fact that all matter attracts other particles with in space with respect to gravitational forces, therefore space is not zero gravity, even though it may feel as such to the astronauts with respect to their very primitive and basic observations.

It is only with respect to combined matter density of any object, and distance from each object in question in which less dense particle matter objects will observe reactive responses by the more dense particle matter objects.

Thus gravitational attraction is vacuum energy acceleration through particle matter which functions with direct respect to Universal linear expansion in all directions.

And Zero Gravity is extremely Rare and has never been observed.

The reason I ask this question, is because I recently answered a question which was posed to me as Suppose the acceleration of an object is zero. Does this mean that there are no forces acting on it? my answer was No, because if any objects acceleration is zero, then all forces must act upon it equally, however the person whom was chosen as the best response answered that gravity force would still affect the object.

as I see it if the object is located upon earth, then yes, gravitational force is acting upon it, however it would not have zero acceleration, even at rest.

Gravity therefore is observed with respect to unequal acceleration be it linear, curved, rotation, or vortex, or a combination of those forces acting unequally upon an object.

therefore zero acceleration, in my mind indicates absolute zero acceleration, and for that function to be observed all reference frames of motion must react absolutely equally upon the object in all directions, and has never been observed

Therefore in my minds eye, gravity has to function with respect to any of the singular accelerations which I mentioned above, and a combination of all acceleration states acting together. and a measurement of all acceleration states should be devised upon a scale so that we may better understand gravity it's self with respect given to how all of those acceleration functions increase, or decrease gravity attraction with respect to known density's.

Also as I see it energy it's self has to be a fluid state for gravity to even function with in it, and for atomic cohesion to even be present, and with known understanding given to all of these subjects of study which I speak of acceleration is always constant and is never zero.

Answer 1

Asronauts and technicians don't say "zero gravity". They usually refer to it as a "microgravity environment".

Answer 2

First of all, we mere mortals who don't venture beyond the earth's crust, rarely experience any force more profound than gravity. By profound, I mean it affects us all the time, every day, and it prevents us from being flung out into space. When we refer to astronauts experiencing zero gravity, we really mean "zero net force".

Consider this:

A point mass cannot discern the root cause of each force acting upon it, all it can respond to is the NET force acting on it. In an extreme case, if a point mass was sitting equidistant and between two equally massive black holes which were a few miles apart, the point mass would experience no net force on it, so would be "unaware" of any forces acting upon it. Hence it would experience "zero gravity" even though it was under the influence of two enormous gravitational fields. Note that I have used the term "point mass", since if the mass had any structure at all it would disintegrate under the stress.

So, while an astronaut is in space, they will be experiencing the gravitational pull from every object with mass in the universe, (as we all do) however the net effect, including the centripetal force of rotating around the earth, will be very small, even negligible.

The force due to gravity between two bodies is given by:

F=kxm1xm2/d^2 where k is the gravitational constant, m1 and m2 are the body's respective masses and d is the distance between them.

Since people (as long as the human race survives) will always have a mass and there will always be at least one other body in the universe some distance away, there will always be forces of gravitational attraction.

Answer 3

True, gravity is one of the forces that act without limits on the distance. However, it is also true that the astronauts do not feel the gravity at all, effectively in a zero-gravity state. This state is known as free-fall, although nothing is falling in our general sense.

It is only a matter of frame of reference. If your frame of reference (the astronaut) is accelerating (falling) at the same speed as and experimental object, then it would seem like the object is hanging in the air.

This case is achieved when the thrusters of the rockets go off and the whole shuttle goes on a free fall. If the orbit is high enough, the centripetal force would balance the gravitational force and give the shuttle a stable altitude together with the feeling of zero-gravity. The space missions do use this principle to conserve fuel.

So, zero gravity, although only an illusion, can be experienced.

Answer 4

I think that many people still think of gravity as a force as a matter of convenience, rather than cluttering up a conversation with too many details. In my opinion... Say you have a ray of light traveling from point A to Point B. Say that the ray of light will pass close to a star. We know that time is 'dilated' near a gravitating object. So, we know that the light ray will be slowed when traveling through the dilated time. We know from wave mechanics that light will find the 'fastest' path between two points. Therefore, rather than traveling through the densest part of the dilated time, the light will follow a curved path around the 'slowest' regions of space-time (that is, near the star), and will appear to be bent toward the star, when it is actually avoiding it. Notice that in this scenario, the light ray bends but space is not bent, per se. Rather, regions of space are 'slowed down' due to the presence of the massive objects. The question still remains: How does gravity slow down time? Also recall that atoms and molecules are held together by a continual exchange of photons. These photons may also be effected by the same phenomenon, effecting the whole atom, with the result the the atom 'falls' toward the massive object. It's just an idea. Hope you liked it.

Answer 5

Strictly speaking gravity exists in space. But from the viewpoint of the astronauts, the effect to their body is that they can't feel any gravity at all. Why? Because the spaceship moves around the earth, to get the necessary acceleration (moving around a circle produces radial acceleration) to counteract the effects of gravity. This is just about the frame of reference. So they are right in saying zero or micro gravity.

Answer 6

But you're speaking to a population of non-scientists that need the simplest explanation to their observations. While gravity does exist everywhere by definition, the observation the people see are astronauts and equipment floating. They need an explanation for the observed facts thus zero-gravity.
Heck we still have some people that think the sun moves across the sky!!!

Answer 7

If you would work on your science as much as your long winded ravings you'd know that the gravity where the astronauts are is barely reduced at all, and they only float because of the centripetal force pulling them outward. Zero gravity is just the state whenever you're in free fall. It's valid to refer to a person jumping off a cliff as being in zero gravity until the air starts slowing him down.
Stringing a lot of long words together that you don't understand isn't going to convince anybody but other pretend scientists that you know what you're talking about.

Answer 8

zero gravity is the abstance of gravity. your observation is correct when you see objects (basic observation) in zero gravity move as if it is either attracted or repelled by each other. movement in space is caused by other forces that becomes more relevant because of the abstance of gravity. positive and negative charged objects or particles will now move toward each other effortlessly. as well as objects will bounce off of each other boinciness, etc. the understanding of energy and other motion forces become more evident with zero gravity.

Answer 9

Most of the things are relative. So unless you need precise 0.000000000000000000000000000000... figure, you can call 0.0001 a zero with respect to a 100.

Answer 10

You are absolutely right...there is no place in entire universe as zero gravity.