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Re:The Size of the Human Radio-Broadcast Bubble in the Milky... by ars on Sunday February 06, 2011 @02:50PM (#2186294)
On a subatomic (and subnucleonic) scale it's 100% empty space.

Fundamental particles are true point particles and no spatial extent has ever been found for them.

So it's not just a lot of empty space - it's nothing except empty space.

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