How small would the Universe be if the space between particles were eliminated?

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Offline Chemistry4me

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How small would the Universe be if all of the space between particles (protons, neutrons, electrons etc...) was non-existent? How small would the Earth be?

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Offline neilep

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The universe would be the size of a grapefruit !..I know this is right because I asked someone !
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Offline Don_1

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A grapefruit? Well that's my diet buggered then, I just ate the bloody universe!
If brains were made of dynamite, I wouldn't have enough to blow my nose.

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Offline Chemistry4me

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Whoa, a grapefruit!?!

I suppose I should also ask what the density of the universe is.

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Offline syhprum

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I believe this grapefruit size assumes everything is compressed to Planck density, particles could not exist at this density everything must be pure energy.

Planck density 5.1 10^96 kg/m3
« Last Edit: 20/06/2009 15:51:20 by syhprum »
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Offline Chemistry4me

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So any idea of what the size would be if they weren't compressed to Planck density?

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Offline Bored chemist

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The universe would be the same size, it's just that all the stuff in it would take up less space so there would be a big empty space round it.
« Last Edit: 21/06/2009 15:44:08 by Bored chemist »
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Offline neilep

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erhmm...I was only jesting about grapefruit size....I really meant a grape !..cos someone else told me that too !  [;)]

Men are the same as women, just inside out !

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Offline Shadec

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i heard, from a cosmologist doctor guy (actual title :P) that the EARTH would be one cm cubed if all the space between sub-atomic particles (like protons, neutrons and electrons) was eliminated.
well i guess it doesnt really matter, and i suppose it might vary depending on peoples calculations.

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Offline Chemistry4me

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Hey, thanks Shadec

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Offline syhprum

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compressed to Planck density it would have a diameter of 1.28/10^22 meters.
« Last Edit: 25/06/2009 16:33:13 by syhprum »
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Offline Chemistry4me

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And how does that compare to a hydrogen atom?

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Offline syhprum

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Quote from 'Wiki' "the diameter of the nucleus is measured in Femometers (10^-15)" so the size is vastly smaller I can only surmise that this degree of compression is only postulated for the singularity within a blackhole.
Nucleur density is quoted as 3*10^17 Kg per M^3
« Last Edit: 26/06/2009 09:19:16 by syhprum »
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Offline Chemistry4me

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Thanks, for my feeble mind I think this is quite amazing.