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This thread is like a broken pencil: pointless.
Morituri:
It occurred to me today to wonder why people assumed that the universe is finite, or expanded from a point after the big bang. Why people made up the idea of "cosmic inflation" to explain the sheer bigness of what we see around us and the fact that it can't all have come from a point at less than lightspeed during the time of the universe's existence.
It appears to have been infinitely dense, or nearly so, at the instant of the Big Bang.
It does not follow from infinite density though, that its size was ever small.
Infinity, plus the amount of space that's been added, (and is still being added) is still infinity. Infinity (space) divided by any slightly-smaller infinity (matter) is still infinitely dense. The Big Bang, for all we can tell, may have happened across infinite space, rather than just at a point.
We'll never see more than what's inside our lightspeed horizon, but that doesn't mean it's not out there. And it doesn't put any kind of limit on how much of it there might be.
So why did we need cosmic inflation again?
Tova:
As far as I know, the observations of distant objects whose light was redshifted is what led to the conclusion that the universe is expanding (don't ask me how they figured this out, but I think it had something to do with the degree of shifting being related to distance or something).
Tova:
LeeC:
--- Quote from: Morituri on 21 Jan 2019, 21:36 ---It occurred to me today to wonder why people assumed that the universe is finite, or expanded from a point after the big bang. Why people made up the idea of "cosmic inflation" to explain the sheer bigness of what we see around us and the fact that it can't all have come from a point at less than lightspeed during the time of the universe's existence.
It appears to have been infinitely dense, or nearly so, at the instant of the Big Bang.
It does not follow from infinite density though, that its size was ever small.
Infinity, plus the amount of space that's been added, (and is still being added) is still infinity. Infinity (space) divided by any slightly-smaller infinity (matter) is still infinitely dense. The Big Bang, for all we can tell, may have happened across infinite space, rather than just at a point.
We'll never see more than what's inside our lightspeed horizon, but that doesn't mean it's not out there. And it doesn't put any kind of limit on how much of it there might be.
So why did we need cosmic inflation again?
--- End quote ---
A brief history and science explanation, very brief but I think its a good starting off point to look into it more.
//www.youtube.com/watch?v=t9276Lk_Ipg
//www.youtube.com/watch?v=tXkBfkeJJ5c
LeeC:
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