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<blockquote data-quote="Umbran" data-source="post: 6132800" data-attributes="member: 177">Freyar may correct me slightly but...No such thing.&nbsp; The expansion we are talking about is a gravitational effect.&nbsp; Think of it this way - imagine as if the Universe was filled with a very, very thin fog of stuff* that had gravitational repulsion, rather than attraction.&nbsp; Near massive objects (planets, stars, galaxies) you don't notice.&nbsp; The stuff is so very thin, that compared to the local normal mass it just doesn't show up.&nbsp; But out in the deeps, the real deeps, where there's nothing else, that thin fog of stuff dominates.&nbsp; And there is a whole lot of deeps.&nbsp; Lots and lots of deeps.&nbsp; So, overall, in the universe, this thin stuff dominates in the long run.You don't see any notable different lensing effect.&nbsp; The fog is pretty darned evenly distributed across everywhere - it doesn't clump up with or away from the normal matter, there is no boundary or transition layer we can point to of &quot;here there is expansion, here there is not&quot;.&nbsp; You may not be too wrong to really think that the dark energy that does this isn't a separate thing at all, but is associated with space itself.&nbsp; Or you could say that it is as if space expands by default.&nbsp; That's what it does - expands faster and faster, forever.&nbsp; It is only locally around masses where it *doesn't* expand like that, where there is something that halts this larger scale process.*This is not a fog of physical material, or normal matter with exotic properties.&nbsp; This is just an analogy to grant a visualization that may help with the concept.</blockquote>

[QUOTE="Umbran, post: 6132800, member: 177"] Freyar may correct me slightly but... No such thing. The expansion we are talking about is a gravitational effect. Think of it this way - imagine as if the Universe was filled with a very, very thin fog of stuff* that had gravitational repulsion, rather than attraction. Near massive objects (planets, stars, galaxies) you don't notice. The stuff is so very thin, that compared to the local normal mass it just doesn't show up. But out in the deeps, the real deeps, where there's nothing else, that thin fog of stuff dominates. And there is a whole lot of deeps. Lots and lots of deeps. So, overall, in the universe, this thin stuff dominates in the long run. You don't see any notable different lensing effect. The fog is pretty darned evenly distributed across everywhere - it doesn't clump up with or away from the normal matter, there is no boundary or transition layer we can point to of "here there is expansion, here there is not". You may not be too wrong to really think that the dark energy that does this isn't a separate thing at all, but is associated with space itself. Or you could say that it is as if space expands by default. That's what it does - expands faster and faster, forever. It is only locally around masses where it *doesn't* expand like that, where there is something that halts this larger scale process. *This is not a fog of physical material, or normal matter with exotic properties. This is just an analogy to grant a visualization that may help with the concept. [/QUOTE]

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