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2007-08-03 03:35:38 · 11 answers · asked by Cutthroat Lars 2 in Science & Mathematics Astronomy & Space

Ok so gravity exists everywhere. The earth pulls on the moon...the sun pulls on the earth...the center of the galaxy pulls on the sun....but if gravity is existant everywhere....what pulls on the galaxy?? gravity does not exist everywhere...if it did...the universe wouldnt exist, it would all be pulled to the main source of gravity eventually causing the collapse of everything known and unknown

2007-08-03 05:12:25 · update #1

or perhaps it does and the collapse hasnt happened yet.

2007-08-03 05:13:13 · update #2

11 answers

G-forces area are result of acceleration, not necessarily gravity. It is measured as a multiple of earth's gravity because it is easier for most people to grasp and gravity itself is an acceleration force.

The amount of G's experienced by someone leaving the earth's gravity will barely be affected by the amount of g-force lost without the earth's pull. Rocket acceleration is far greater.

2007-08-03 03:41:17 · answer #1 · answered by most important person you know 3 · 0 0

Yes...however, gravity is never non-existant. The reason there is "zero-gravity" is because of a state of free-fall...for example, when you see astronauts appearing to float, they are actually just falling WITH the shuttle, or whatever vehicle they're within. An orbit is actually a free-fall with enough horizontal velocity to keep an object falling AROUND the planet...if it's speed were to slow, you would then have a "decaying orbit", and the object would eventually fall more "down wards" into the planet.
But the effect of gravity is still there....even if you get far enough away from the earth, you would still have an attraction towards wherever the strongest gravitational source is. This is why space missions need to be very carefully charted and timed appropriately...so all gravitational forces will get the ship where they want it to go. It's more important than the propulsion system.

ps to follow-up---the Universe's expansion is what is keeping the Universe from collapsing via gravity...it counters universal gravity enough so that current predictions by scientists indicate there will never be a collapse. The Universe should continue to expand forever...in fact, recent readings indicate the expansion is actually accellerating.

2007-08-03 03:53:17 · answer #2 · answered by bradxschuman 6 · 0 0

Where gravity does not exist is wrong . The black hole in the center of the Galaxy has a gravity well that keeps all the solar systems in orbit. The gravity well could be 100 light years across.

2007-08-03 04:57:32 · answer #3 · answered by JOHNNIE B 7 · 0 0

Even when the astronauts are weightless in orbit, there is gravity. It is gravity that keeps them orbiting Earth and not hurtling off into interplanetary space in a straight line. They are only weightless because they are "falling" around the earth. Anything in orbit is always falling, but going so fast sideways that the curved surface of the Earth curves out from under them as fast as they fall so they never get closer to the ground. And when the fire their rocket engines, they do feel the G forces.

2007-08-03 04:44:31 · answer #4 · answered by campbelp2002 7 · 0 0

Yes, this is where they get artificial gravity from. Of course you cannot make gravity, but other forces can be used to replicate it. In this case, inertia. Inertia is what causes "g-forces" in space. They are NOT g-forces, but they mimick them. Your body wants to stay in its current state, so trying to alter that state will put forces on your body. Think about being on the inside of a rotating cylinder. If it is spinning fast enough, you would be able to stand and walk on the walls right? Because you will be pushed against the outside wall, just like the cylinder is trying to throw you out of it. This can be used in space to mimick gravity.

2007-08-03 03:41:54 · answer #5 · answered by Anonymous · 0 0

scientific concept works via making a sort. The sort does no extra beneficial than describe certainty. It would not persist with that because of the fact Einstein's sort of mass distorting area behaves like gravity then that's what gravity is. that is. despite if if we detect a gravitational effect that's inconsistent with the belief of warping area, then the belief is inaccurate! The absence of contradicting information would not recommend that the belief is nice. you are able to in no way be conscious of that.

2016-12-15 04:37:49 · answer #6 · answered by Anonymous · 0 0

Acceleration in space can be used to simulate gravity. That's why plans for big space stations have a large revolving wheel to simulate Earth gravity.

2007-08-03 05:38:31 · answer #7 · answered by Owl Eye 5 · 0 0

The existance of the Gforce in space and what it does ,is very well discussed by David Thomson & Jim Bourassa in their theory of Quantum Aether Dynamics.
It appears that with out this GForce in space gravity would be non existant.

2007-08-03 04:43:53 · answer #8 · answered by goring 6 · 0 0

Well, g-forces can be attributed to mass (all mass has gravitational pull), or accelleration. If you were in a rocket that fired it's engines, you'd feel some degree of force on your body - a G force - that would act as long as the engine was on and 'pushing' you. When the engine would turn off, you'd be weightless again.

2007-08-03 04:17:09 · answer #9 · answered by quantumclaustrophobe 7 · 0 0

Gravity is never non-existant. On the contrary, it is universal, although it does follow the inverse square rule in regards to its effects.

2007-08-03 03:44:20 · answer #10 · answered by Anonymous · 0 0

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