# The Naked Scientists Forum

### Author Topic: How small would the Universe be if the space between particles were eliminated?  (Read 3312 times)

#### Chemistry4me

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##### How small would the Universe be if the space between particles were eliminated?
« on: 20/06/2009 07:08:58 »
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?

#### neilep

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #1 on: 20/06/2009 11:40:39 »
The universe would be the size of a grapefruit !..I know this is right because I asked someone !

#### Don_1

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #2 on: 20/06/2009 12:16:30 »
A grapefruit? Well that's my diet buggered then, I just ate the bloody universe!

#### Chemistry4me

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #3 on: 20/06/2009 12:51:15 »
Whoa, a grapefruit!?!

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

#### syhprum

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #4 on: 20/06/2009 15:48:21 »
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 »

#### Chemistry4me

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #5 on: 21/06/2009 00:22:53 »
So any idea of what the size would be if they weren't compressed to Planck density?

#### Bored chemist

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #6 on: 21/06/2009 15:41:23 »
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 »

#### neilep

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #7 on: 21/06/2009 21:04:40 »
erhmm...I was only jesting about grapefruit size....I really meant a grape !..cos someone else told me that too !

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #8 on: 25/06/2009 10:28:51 »
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.

#### Chemistry4me

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #9 on: 25/06/2009 10:37:00 »

#### syhprum

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #10 on: 25/06/2009 11:42:34 »
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 »

#### Chemistry4me

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #11 on: 26/06/2009 08:32:39 »
And how does that compare to a hydrogen atom?

#### syhprum

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #12 on: 26/06/2009 09:14:18 »
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 »

#### Chemistry4me

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##### How small would the Universe be if the space between particles were eliminated?
« Reply #13 on: 26/06/2009 09:21:25 »
Thanks, for my feeble mind I think this is quite amazing.

#### The Naked Scientists Forum

##### How small would the Universe be if the space between particles were eliminated?
« Reply #13 on: 26/06/2009 09:21:25 »