When Was the Universe's Expansion Rate Zero?

AI Thread Summary
The discussion centers on the concept of the universe's expansion rate and whether it ever reached zero. It is clarified that the expansion rate has never been zero, and as time progresses backward, the rate of expansion increases rather than decreases. The Big Bang marks the limit of useful predictions, beyond which extrapolation leads to infinities, complicating any calculations regarding the universe's age. Current cosmological models, including the Friedman equation, suggest the universe is approximately 13.8 billion years old, based on empirical observations. Understanding these models requires a solid grasp of cosmology and mathematics, as speculative theories are discouraged in favor of established scientific principles.
  • #51
SteveK2 said:
I'm pretty sure I have seen an estimate of the size of the universe

If you find one that's not ##\infty##, please post it, it will be of great interest. Be sure it's an estimate of the size of the entire universe, not just the observable universe, though.
 
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  • #52
SteveK2 said:
I am truly amazed at this discussion! It would be like someone asking me, a PhD in Marine Science, some basic question on oceanography.

It may seem that way to you, but remember that, in this situation, we are the ones in the position of the PhD, not you, and what seems like a "basic question" to a person not knowledgeable in a field might not seem that way to someone who is knowledgeable. To us, this discussion is not like someone asking a basic question, like "what is the volume of Earth's oceans". It's like someone asking a question that actually doesn't make sense at all, like "what is the elasticity of Earth's oceans". And then, when you point out that the oceans are liquid, not solid, and don't have an elasticity, the person says, "look, forget about your model that says the oceans are liquid, just give me the parameters of Earth's oceans and I'll calculate the elasticity myself".
 
  • #53
Thread closed for moderation.
 
  • #54
Since the OP's question has been answered more than once, this thread will remain closed.
 
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