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The beginning of the Universe would have been loud
(lemmy.world)
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this post was submitted on 17 Jul 2026
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Showerthoughts
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A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The most popular seem to be lighthearted clever little truths, hidden in daily life.
Here are some examples to inspire your own showerthoughts:
- Both “200” and “160” are 2 minutes in microwave math
- When you’re a kid, you don’t realize you’re also watching your mom and dad grow up.
- More dreams have been destroyed by alarm clocks than anything else
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The edge of the observable universe is not because of that.
It is because space expands. Therefore everything goes away from everything else. Therefore, everything goes away from us. And the more space there is between us and that other thing, the more space expands, since there is more space. Therefore, things that are farther away from us, get away from us faster than everything else. Only if it is close enough to us that gravity is strong enough would that something not move away from us.
This creates a peculiar situation. Things that are far enough away from us, actually move away from us faster than the speed of light. This means that no photon ever emitted from this far away will ever reach us.
That is the edge of the observable universe. The distance at which a photon emitted in our direction will never reach us, since for every meter the photon travels, there is at least a meter of space "created" between us. Therefore it never progresses in moving towards us, in fact, it moves away from us even though it is traveling in our direction.