[ron123456 (OP)]

To us on earth, is this because of our black hole in the Milky Way?..... Beyond, …..perhaps our universe has an influence with it's own gravitational centre? …….Does centrifugal and centripetal force enter the picture and contribute to gravitational force?.... Of course, once again, lets dismiss curved space....just casual ...thx

[ron123456 (OP)]

Is all gravitation in our galaxy (and beyond (universe)) due to outside the actual mass? Do the centripetal and centrifugal forces of black holes and(?)  actually produce all gravity?

[Kryptid]

To us on earth, is this because of our black hole in the Milky Way?

No. Sagittarius A* is not what makes Earth have gravity. The Earth's mass is what gives it gravity.

lets dismiss curved space

Dismissing an important part of the correct answer is not a good way to start the thread.

Do the centripetal and centrifugal forces of black holes and(?)  actually produce all gravity?

No.

[ron123456 (OP)]

Yes, you are correct....the above is far fetched and goofy......It just is frustrating that Newtonian Physics cannot explain why a mass has gravity unless I missing the answer from that viewpoint...

[Colin2B]

It just is frustrating that Newtonian Physics cannot explain why a mass has gravity unless I missing the answer from that viewpoint...

A lot of physics is about describing and predicting, which Newton did very well.
If Galileo had succeeded in measuring the speed of light it is possible he could have extended relativity to special relativity, or maybe Faraday could have later, and with his maths Newton might have extended further to GR.

[Petrochemicals]

My theory is pressure, if you stick a child on a trampoline it  creates tension that is greatest around the child, this tension is lessened the further fron the child due to less material. How you balance this with observations of increased timespeed is another.

[Colin2B]

My theory is pressure, if you stick a child on a trampoline it  creates tension that is greatest around the child, this tension is lessened the further fron the child due to less material.

This still doesn't provide an answer - what causes the 'pressure/tension??

[alancalverd]

It's a very odd force indeed.

If it is transmitted across space by gravitons, how does the receiving object know which way to move?

It seems that gravitons travel at c.  If the graviton carries some directional history, then it has momentum. But unlike a photon, when that momentum is imparted to a receiver, it causes the receiver to move towards, not away from, the source. So the equivalent mass of a graviton is negative. Thus since all masses emit gravitons, all masses must be increasing and therefore emitting more gravitons with time. This is not observed, but the effect may be very small. If it is true, then the observable universe must eventually collapse to a single black hole. The question is why is it actually expanding?

So we must suppose that gravitons do not carry individual directional information. If there is a significant graviton flux at the receiver, it might move in the direction to maximise the flux. This consists with observation. But at some point in a hypothetical two-body universe, the flux from A to B is so low that only one graviton reaches B at a time, so objects at very large separations do not tend to coalesce because there is no "towards" vector.

[Bored chemist]

It's a very odd force indeed.

We know of 4 forces.
Half of them behave this way.
So... not all that odd.

[Halc]

If it is transmitted across space by gravitons, how does the receiving object know which way to move?

Gravity is not tranmitted between gravitons.  A non-accelerating mass emits no gravitons at all, despite giving weight to objects on its surface.
Gravitons mediate changes in the gravitational field, but do not mediate the field itself.

[alancalverd]

It's a very odd force indeed.

We know of 4 forces.
Half of them behave this way.
So... not all that odd.

It's way past my sell-by date, but I can't think of another force that only sucks.

[Petrochemicals]

If it is transmitted across space by gravitons, how does the receiving object know which way to move?

Gravity is not tranmitted between gravitons.  A non-accelerating mass emits no gravitons at all, despite giving weight to objects on its surface.
Gravitons mediate changes in the gravitational field, but do not mediate the field itself.

if space is expanding and accelerating also(like the early stages of an explosion) how do you know.

My theory is pressure, if you stick a child on a trampoline it  creates tension that is greatest around the child, this tension is lessened the further fron the child due to less material.

This still doesn't provide an answer - what causes the 'pressure/tension??

Could you enlighten me?