The Naked Scientists

The Naked Scientists Forum

Author Topic: Does gravity cancel out at the centre of a hollow sphere?  (Read 9907 times)

Offline yor_on

  • Naked Science Forum GOD!
  • *******
  • Posts: 11987
  • Thanked: 4 times
  • (Ah, yes:) *a table is always good to hide under*
    • View Profile
Does gravity cancel out at the centre of a hollow sphere?
« Reply #25 on: 30/06/2010 05:21:05 »
Well, then it won't be a perfect sphere will it?
:)

But sh*, I don't know either :)
It's like Murchie said.
Is it an accurate description of 'reality'? :)
 

Offline Geezer

  • Neilep Level Member
  • ******
  • Posts: 8328
  • "Vive la résistance!"
    • View Profile
Does gravity cancel out at the centre of a hollow sphere?
« Reply #26 on: 30/06/2010 05:47:44 »
Well, then it won't be a perfect sphere will it?

True. But like they say, "No body is perfect".

Sorry for that! But, in fact, it's probably true. It's more about the stability of the system. A system that is "perfectly" balanced but intrinsically unstable will disintegrate in no time. Noise will guarantee it, and there is no escape from noise.
 

Offline Frodeborli

  • First timers
  • *
  • Posts: 8
    • View Profile
Does gravity cancel out at the centre of a hollow sphere?
« Reply #27 on: 01/07/2010 21:31:16 »
If all mass and energy was at one point in time concentrated at one spot, isn't it symmetrical then? If it suddenly explodes (Big Bang), it would still be perfectly symmetrical - since nothing "outside" can destabilize the symmetry...
 

Offline yor_on

  • Naked Science Forum GOD!
  • *******
  • Posts: 11987
  • Thanked: 4 times
  • (Ah, yes:) *a table is always good to hide under*
    • View Profile
Does gravity cancel out at the centre of a hollow sphere?
« Reply #28 on: 03/07/2010 09:41:15 »
It's all about geometry, one way or another.
Either the geometry and ways we use are correct even if 'plastic' and then you should be able to define a center even to a black hole. Or we don't really know how it is working and as Murchie wrote. "According to Micheo kaku, at the centre of spinning black holes is an eye, like the eye of a storm with the matter swirling around it, its a relatively new proposal."

Now, if that is correct then where did the geometry go?
===

Rereading the citation, maybe he don't question a center, just propose a still area around it? :)

But I agree Frodeborli, there is nothing wrong in imaging a perfect symmetry, although, most everything we observe won't have it.
« Last Edit: 03/07/2010 09:47:04 by yor_on »
 

The Naked Scientists Forum

Does gravity cancel out at the centre of a hollow sphere?
« Reply #28 on: 03/07/2010 09:41:15 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums