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Space Is Expanding, Not Structures.

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Posted by Alexander on November 23, 2001 22:47:49 UTC

Suppose, two atoms (or anything else) do NOT interact with each other (say, are far enough away.) Then the distance between them is increasing with the Hubble speed (about 70 m/sec per kiloparsec). You may consider them "at rest in respect to surrounding space" although it is not correct expression because space does not have any "markers" to hang on.

But if atoms are interacting, then they are no longer "at rest": by attracting (or repelling) each other they move close (or away) and may settle at some equilibrium distnce (forming a molecule, or a solid, etc) which depends on the nature of force (interaction) between them. E/m force depends on c, e, h, so expansion of space does not affect size of molecules, planets or stars. But it affects distance between non-interacting atoms and systems (say, atoms in free space can be considered to be far enough away from each other to neglect their e/m interaction, although weak gravitational bonding between them should be taken into consideration too and may affect rate of increase of the distance between atoms).

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