What could cause the earth to lose its gravity?

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Offline kyscreth

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What could cause the earth to lose its gravity?
« on: 02/10/2009 08:25:35 »
Does anyone have any ideas how the earth or any other planet could lose its gravity?? either over a long or short amount of time..
any ideas would be appreciated, cheers.
 

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Offline Mr. Scientist

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What could cause the earth to lose its gravity?
« Reply #1 on: 02/10/2009 08:29:02 »
Only one solution. A loss of gravity would mean a loss of mass.
http://www.youtube.com/watch?v=SZGcNx8nV8U

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Offline syhprum

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What could cause the earth to lose its gravity?
« Reply #2 on: 02/10/2009 15:39:28 »
When LHC gets going and drops a dreaded blackhole into the centre of the Earth causing it to collapse almost instantly into a 50 millmeter radius ball we who are living 6400 Km from the the centre at present will notice an immediate loss of gravity.
This will not last long as we drop towards the centre very gently at first it will rapidly increase and reach a quite uncomfortable level!.
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Offline neilep

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What could cause the earth to lose its gravity?
« Reply #3 on: 02/10/2009 18:14:55 »
Will it help if I am upon an airomobile when this happens ?
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Offline LeeE

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What could cause the earth to lose its gravity?
« Reply #4 on: 02/10/2009 19:31:40 »
When LHC gets going and drops a dreaded blackhole into the centre of the Earth causing it to collapse almost instantly into a 50 millmeter radius ball we who are living 6400 Km from the the centre at present will notice an immediate loss of gravity.
This will not last long as we drop towards the centre very gently at first it will rapidly increase and reach a quite uncomfortable level!.

The Schwarzchild radius for the Earth is a little under 9mm, iirc.  Were the Earth to be instantly transformed into such a black hole there would be no change in the 'strength' of gravity at the original radius of the Earth i.e. where it's surface was.  There would be no loss of gravity and anything left there would just start accelerating towards the center at 1G.

If a micro black hole were to fall into the Earth from its surface, the Earth would not collapse almost instantly; the fastest that the surface could collapse would still be 1G and in fact it's likely that the Earth would take quite some time to collapse, probably over a period of days to months.  The micro-BH would oscillate back and forth through the Earth, initially with relatively little slowing, but getting slower with each pass and eventually settling at the center.  As matter fell into the micro-BH energy would be released by the in-falling matter, effectively producing a back-pressure that would slow the rate of further in-fall.  Although the collapse would start slowly, it would speed up over time and total effective collapse would be inevitable in the end.
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Offline syhprum

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What could cause the earth to lose its gravity?
« Reply #5 on: 02/10/2009 20:59:00 »
I did not expect my post to be taken too seriously but I am pleased to see any serious analyses of the scenario.
« Last Edit: 02/10/2009 21:07:52 by syhprum »
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Offline RD

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What could cause the earth to lose its gravity?
« Reply #6 on: 02/10/2009 21:08:45 »
What about the  Lagrange point L1 ? where gravity is cancelled out.
http://en.wikipedia.org/wiki/Lagrangian_point

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Offline syhprum

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What could cause the earth to lose its gravity?
« Reply #7 on: 30/11/2009 14:46:25 »
If mathematicians found serious errors in Einstein and Newtons calculations
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Offline yor_on

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What could cause the earth to lose its gravity?
« Reply #8 on: 13/12/2009 00:04:26 »
Gravity is related to mass and acceleration. As soon as you stop accelerating you become 'weightless' if in space. So to get to a state without gravity I think you would need to be as far away from any mass and acceleration as possible.
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Offline Mr. Scientist

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What could cause the earth to lose its gravity?
« Reply #9 on: 13/12/2009 00:38:40 »
Does anyone have any ideas how the earth or any other planet could lose its gravity?? either over a long or short amount of time..
any ideas would be appreciated, cheers.
 

Not without the absence of the matter earth is comprised of. :)
http://www.youtube.com/watch?v=SZGcNx8nV8U

''God could not have had much time on His hands when he formed the Planck Lengths.''

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Offline Mr. Scientist

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What could cause the earth to lose its gravity?
« Reply #10 on: 13/12/2009 00:39:25 »
Or a gradual but long gravitational radiation.
http://www.youtube.com/watch?v=SZGcNx8nV8U

''God could not have had much time on His hands when he formed the Planck Lengths.''

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Offline Mr. Scientist

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What could cause the earth to lose its gravity?
« Reply #11 on: 13/12/2009 00:40:20 »
Gravity is related to mass and acceleration. As soon as you stop accelerating you become 'weightless' if in space. So to get to a state without gravity I think you would need to be as far away from any mass and acceleration as possible.

Listen to this one - he is also true.
http://www.youtube.com/watch?v=SZGcNx8nV8U

''God could not have had much time on His hands when he formed the Planck Lengths.''

 ̿ ̿ ̿ ̿̿'\̵͇̿̿\=(●̪•)=/̵͇̿̿/'̿'̿̿̿ ̿ ̿̿ ̿ ̿

٩๏̯͡๏۶

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Offline yor_on

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What could cause the earth to lose its gravity?
« Reply #12 on: 25/12/2009 07:13:51 »
Nah not really, but thanks all the same Mr S. Thinking of it you need to get outside SpaceTime to get out of gravitational influences. The universe binds together by gravity so?
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Offline Pmb

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What could cause the earth to lose its gravity?
« Reply #13 on: 27/12/2009 03:14:42 »
When LHC gets going and drops a dreaded blackhole into the centre of the Earth causing it to collapse almost instantly into a 50 millmeter radius ball we who are living 6400 Km from the the centre at present will notice an immediate loss of gravity.
This will not last long as we drop towards the centre very gently at first it will rapidly increase and reach a quite uncomfortable level!.
That is not true. We'd never know the difference if our distance from the center of the Earth remained the same.

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Offline syhprum

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What could cause the earth to lose its gravity?
« Reply #14 on: 27/12/2009 10:08:54 »
LeeE has published a more detailed account of what will happen.
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Offline questioner

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What could cause the earth to lose its gravity?
« Reply #15 on: 31/12/2009 00:52:15 »
Gravity gets weaker as we travel away from the earth so it must be stronger as we get closer to the centre. The density in the centre of the earth must be immense. If you could remove the core of the planet wouldn't it collapse into dust.


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Offline Geezer

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What could cause the earth to lose its gravity?
« Reply #16 on: 31/12/2009 06:44:15 »
Gravity gets weaker as we travel away from the earth so it must be stronger as we get closer to the centre. The density in the centre of the earth must be immense. If you could remove the core of the planet wouldn't it collapse into dust.



Er well, no. If you were able to survive at the centre of the Earth, the Earth would exert no gravitational force on you at all. The mass of the Earth would be equally distributed around you in three dimensions, so the gravitational forces from the Earth's mass would sum to zero.
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