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The beginning of the Universe would have been loud (lemmy.world)
submitted 2 days ago* (last edited 2 days ago) by Sunflier@lemmy.world to c/showerthoughts@lemmy.world
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We all talk about the big bang as this moment the Universe begins by popping into existence with simple hydrogen and some helium. Hydrogen and Helium are gases that are able to carry sound. Today, space has expanded so much that there is vacume beyond where matter clumps together to form stars/planets, which means the sound couldn't propagate, but the early early Universe wouldn't have clumped like today; there would have been hydrogen everywhere. This means it would have been loud everywhere.

*Edit: I know we call it the Big Bang because of the rapid expansion of spacetime, but I always just pictured the general motion of expansion as the "bang". Never thought of how loud it would have been.

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[-] partofthevoice@lemmy.zip 3 points 2 days ago

The edge of the known universe" is that where there are no more star or galaxy formations?

I believe that would be an area where time has some weird effects, because time is a function of space (as I understand it). There would be no space, there.

But it’s also hard to say whether such an edge even needs to exist. The universe expands everywhere all at once, not from an “edge.” It’s making more space everywhere. Like bread expanding in the oven.

Or could some objects be so far away, there aren't enough light particles left traveling those vast distances to be seen?

That’s the “observable universe” and totally exists.

this post was submitted on 17 Jul 2026
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