Anon01/26/26, 13:11No.16899583
>It is going to keep expanding and expanding faster and faster until all matter is ripped apart with unimaginable vast spaces and cold and dead?
Yes, for our universe at least. But keep in mind the Heat Death theory is just that: a theory. Although there is wide consensus on it by now, it relies on what we can observe right now and from the universe's past. It's not at all certain that the expansion of the universe will keep increasing forever. Maybe in X billion/trillion/quadrillion/etc. years, it might start to slow down, come to a halt entirely or maybe even begin to shrink again. Basically we're watching a race car accelerating and from that observation we infer that it will reach 1,000 km/s in a couple hours. Just because we can't see any slowing down of the universe's expansion RIGHT NOW doesn't mean this will never happen. Who knows?
Changes in the speed of our universe's expansion have already happened in the past (early Big Bang), so there really isn't any reason to automatically assume they won't happen again.>Is this the future of all existence?
Depends on whether our universe really is all of existence or whether other universes exist. Maybe in others the Hubble Constant is lower, balances itself out with gravitational attraction, or mabe is even negative. Alas, we will never know.