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Will Do

Center of Mass

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Will Do

 

Does the universe have a center of mass?

 

 

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Will Do

 

Is the mass of the universe infinite?

 

 

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Will Do

 

The universe is filled with objects of varying amounts of mass.

Does the universe contain an object that has more mass than any other? 

 

 

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psyche101
27 minutes ago, Will Do said:

Is the mass of the universe infinite?

No

19 minutes ago, Will Do said:

The universe is filled with objects of varying amounts of mass.

Does the universe contain an object that has more mass than any other? 

In our observable universe, SPT2349 is probably the largest and heaviest comprising of 14 merging galaxies.

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Guyver

Mass is relative to density.  The greater the density of the object, the more mass it has.  

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Will Do

 

What is the probability that the universe contains a single object that has more mass than any other object?

 

 

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psyche101
8 minutes ago, Guyver said:

Mass is relative to density.  The greater the density of the object, the more mass it has.  

Wills trying to argue that the universe has a centre.

Again.

Probably another dozen or so posts before he gives up again.

Edited by psyche101
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psyche101
7 minutes ago, Will Do said:

What is the probability that the universe contains a single object that has more mass than any other object?

Likely. Highly likely. 

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Will Do

 

If the physical universe is finite, does it have a center of mass?

 

 

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Will Do

 

How likely is it that the center of mass of our solar system is somewhere within the sphere of the sun?

 

 

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Guyver
38 minutes ago, psyche101 said:

Wills trying to argue that the universe has a centre.

Again.

Probably another dozen or so posts before he gives up again.

So what if the universe has an exact center?  Why wouldn’t it?

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Guyver

The problem is that the universe is constantly expanding, so it’s exact center will also be constantly moving.  In physics as I know it.

Edited by Guyver
Typo

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onlookerofmayhem

https://math.ucr.edu/home/baez/physics/Relativity/GR/centre.html

"

Where is the centre of the universe?

There is no centre of the universe!  According to the standard theories of cosmology, the universe started with a "Big Bang" about 14 thousand million years ago and has been expanding ever since.  Yet there is no centre to the expansion; it is the same everywhere.  The Big Bang should not be visualised as an ordinary explosion.  The universe is not expanding out from a centre into space; rather, the whole universe is expanding and it is doing so equally at all places, as far as we can tell."

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psyche101
22 minutes ago, Will Do said:

If the physical universe is finite, does it have a center of mass?

No. If it is finite it folds upon itself to create a torus. Thee is no beggining, no end.

I believe Korg would describe it as a freaky circle.

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psyche101
20 minutes ago, Guyver said:

So what if the universe has an exact center?  Why wouldn’t it?

It cannot because it is constantly expanding within and upon itself.

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Will Do
2 minutes ago, onlookerofmayhem said:

the whole universe is expanding and it is doing so equally at all places, as far as we can tell."

 

Sorry but this does not make sense.

If "all places" are expanding equally, then the expansion of the whole universe would cancel itself out.

Because every "place" would be expanding into every other place.

 

 

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psyche101
16 minutes ago, Guyver said:

The problem is that the universe is constantly expanding, so it’s exact center will also be constantly moving.  In physics as I know it.

There is none. Spacetime is massive. To big to bend it all at once even if there was a centre. What will is proposing is similar to proposing the gravitational pull of an earth satellite directing the orbit of the alpha Centauri cluster of suns.

He has no idea about the actual vastness of space. Until he can wrap his head around that, this discussion will remain a lost cause. 

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psyche101
26 minutes ago, Will Do said:

How likely is it that the center of mass of our solar system is somewhere within the sphere of the sun?

It's not likely, that's exactly what the situation is. The centre wobbles but that's pretty much it.

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Will Do
5 minutes ago, psyche101 said:

No. If it is finite it folds upon itself to create a torus. Thee is no beggining, no end.

 

A torus has a center.

 

 

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Will Do
1 minute ago, psyche101 said:

It's not likely, that's exactly what the situation is. The centre wobbles but that's pretty much it.

 

Yes the sun does wobble but it's also much more massive than all of the planets and other orbiting objects combined making it likely that the center of mass is somewhere within the mass of the sun. As well as the solar system's center of gravity.

 

 

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psyche101
3 minutes ago, Will Do said:

 

A torus has a center.

Your referring to an axial centre. Not the same thing. The universe doesn't have imaginary intersections. Only people who insist it has a centre imagine those .

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psyche101
1 minute ago, Will Do said:

 

Yes the sun does wobble but it's also much more massive than all of the planets and other orbiting objects combined making it likely that the center of mass is somewhere within the mass of the sun. As well as the solar system's center of gravity.

 

 

Yes, that's how spacetime works. 

images?q=tbn:ANd9GcS6VH62e2h8UjMa0wD57Vr

 

You're making the same mistakes you did last time already.

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Golden Duck
31 minutes ago, psyche101 said:

... it folds upon itself to create a torus ...

Taurus.png

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Mr Walker
3 hours ago, onlookerofmayhem said:

https://math.ucr.edu/home/baez/physics/Relativity/GR/centre.html

"

Where is the centre of the universe?

There is no centre of the universe!  According to the standard theories of cosmology, the universe started with a "Big Bang" about 14 thousand million years ago and has been expanding ever since.  Yet there is no centre to the expansion; it is the same everywhere.  The Big Bang should not be visualised as an ordinary explosion.  The universe is not expanding out from a centre into space; rather, the whole universe is expanding and it is doing so equally at all places, as far as we can tell."

There is no centre to the expansion is a different thing to "there is no centre to the mass of the universe "

I think Will is flogging a dead horse here but I understand why he is is doing so and technically he is correct Any physical entity has a centre That centre ma be constantly  changing as the entity changes shape and form  but it simply has to exist in any physical entity Measuring it has been made harder by the realisation /discovery  that the galaxies and systems  are flying apart at an ever increasing pace 

if the universe was infinite, this might not be true (or a t least not measurable ) but the universe is NOT infinite. 

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Nuclear Wessel
14 hours ago, psyche101 said:

Wills trying to argue that the universe has a centre.

Again.

Probably another dozen or so posts before he gives up again.

You weren't wrong.

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