IronSmithFE t1_ix9tv1v wrote on November 21, 2022 at 9:05 PM

Reply to comment by Kiezeus in Someone tell me how the Big Bang began 13 billion years ago, yet the *observable* universe is 83 billion light years apart? by novacks0001

> space between matter in the universe is expanding constantly that causes faster-than-light expansion

at best you'd only get 2x the speed of light in expansion assuming objects were traveling in exactly opposite directions at the speed of light. since nothing but photons and gravity waves are traveling at the speed of light and neither are observable parts of the universe as they travel outwards the universe could not have expanded nearly 80 billion lightyears. at best it could have expanded to a diameter of 26 billion lighyears and that would not be nearly true because no matter what we can observe from our vantage point travels nearly the speed of light.

so, if the observable universe is indeed more than 80billion lightyears in diameter the initial hyperinflation would need have been the vast majority of the expansion of the universe and must continue to be the majority of the expansion for the next 27 billion years. now, because i have no idea how or why matter could have expanded faster than the speed of light your "short story" makes no sense to me.

perhaps you could tell me how matter or protomater could have expanded a great deal faster than the speed of light before you expect me to believe your short story.

Kiezeus t1_ixb96pw wrote on November 22, 2022 at 3:32 AM

There is new empty space emerging from nothingness, and this is different thing that two objects travelling from each other. Think it like this: you and I are located still 1 lightyear from each other, and suddenly 10 light-years worth of new space emerges between us. It would endeed SEEM to us that we would have broken law of relativity, but actually we have not moved faster than light (or in this case, ww havent moved at all!) - there just have becomw more empty space between us. (Edit: accidentally posted too early)

IronSmithFE t1_ixbdi8t wrote on November 22, 2022 at 4:09 AM

> There is new empty space

prove it.

the best you can say for sure is that distant massive bodies are accelerating away from each other. there are a few flimsy theories as to why it is happening, one of which is that there is some kind of dark matter between normal matter which is pushing normal matter around. even if that were the case, the motivation of normal matter would never exceed the speed of light.

Kiezeus t1_ixbit9y wrote on November 22, 2022 at 5:00 AM

Hi, most accepted Dark Energy theory is not based on material/dark particles pushing objects away from each other, you may mix it with Dark Matter theory (explaining "missing" mass of galaxies etc). However, I see that this thread was to explain the issue that universe is larger than light speed would allow, and for this purpose explaining the topic on the currently accepted hypothesis/theories is logical to keep the answers simple. Discussing proving of the dark energy theory and especially doscussiong alternative theories for sure deserve their own thread.