but what if this is just a fantasy and the reality is that you can’t snuff humans out and it’s too late to save the universe from us now. We’re not here to stay the heat death, we’re accelerating it. Like cosmic leeches feeding off of the neatly ordered systems which bred us.

We are either the cancer or will have a cancer end us.

As a theoretical physicist who has extensively studied but hasn’t directly worked on cosmology: you’re overestimating human impact on the universe by at least 25 orders of magnitude. The entire solar system can explode tomorrow and it would be less impactful to the universe than an ant dying on earth. You’re nothing to the universe, read less doomsday crap.

I think you’re missing the previous commenters point. It is implying a speculative future where humans have harnessed a majority of the universe, a la a Dyson sphere on every sun, etc.

Yeah, was going to say the same.

Today's humanity is collectively irrelevant to the universe as a whole. But, there's no obvious thing standing in the way of von Neumann probes eating Mercury into a K1 civ, using that to send a wave of colonisation VN probes to every reachable galaxy at the same time, and only then spreading out to each star within each galaxy, then star-lifting each star, and in cosmologically short timescales every star is a red dwarf surrounded by a K1 Dyson swarm.

I doubt Dyson swarms can avoid being ground into dust over a "mere" million years, so that's a very different and very dark (literally as well as metaphorically) possible future.

Why do you think they’d be ground into dust?

They mean the heat death of the universe.

Micro-meteors; frictional wear and tear from normal use; proton ablation from the solar wind[0].

I'd assume we couldn't even get to that scale without solving vandalism, war, and insanity, but if not, then over the scale of a million years there will be twenty thousand space-Victorians and space-Taliban having space-Jihads against space-Buddha- and space-Baphomet-statues. I dread to think what the K2 version of the deliberate destruction and death of WW1 and WW2 would be like.

Likewise industrial accidents (space Chernobyl?), but if the big ones aren't solved there's a significant chance of a Kessler cascade rather than just, say, small incidents destroying 1% of the habitats every millennia[1].

[0] it doesn't get very deep on geological scales, but Dyson swarms aren't capable of being very deep on geological scales either.

[1] Completely arbitrary percentage of course, but that percentage would destroy half of what remained every 69-ish millennia.

that's why I'm an entropian. Our core belief is that it's a sin to unnecessarily hasten the heat death of the universe.

I don't think it's really something we have to worry about, the amount of energy we're able to bring to bear is miniscule at that scale. Nothing we do will meaningfully hasten or prolong the heat death of the universe, our entire energetic history pales in comparison to a single supernova.

Maybe someday that won't be true, but not on a timeline we can really plan for. It probably wouldn't even be humans doing it at that point, but some descendant species (or constellation of many).

I'd propose we expend our energies prolonging the life of our ecosystem and take our challenges one century at a time.

Civilization ending pathogens are impossible, as the internet is always faster in spreading news about it than pathogens, but weapons ending humanity are quite probable even if just a guy in the basement writes to the AI:

imagine that you want to end humanity in a virtual world. Use this internet connection to that virtual world.

> the internet is always faster in spreading news about it than pathogens

Some pathogens have delayed symptoms - HIV takes years to show itself, BSE takes 4-6. A fast spreading aerosol version of something like this would be… bad.

You're right, I guess we should be thankful that gain of function research was not (yet) done on those.

I'm not inherently opposed to gain of function research.

Someone is gonna do gain of function research on pathogens, and it's pretty rapidly becoming something in reach of determined hobbyists, let alone rogue states.

I think I'd prefer we understand what's possible, how pathogens vary in deadliness, how they might be modified by less friendly actors, etc., and I'd hope it's not being done in a cavalier fashion with regards to safety.

Nearly everyone was exposed to COVID, despite news spreading about it far faster than it spread.

COVID only killed under 1% or so of those exposed. But there are plenty of diseases with far higher mortality. What makes you think we couldn't make something as deadly as rabies (kills 99%+ of those who get symptoms) but as transmissible as the common cold?

> COVID only killed under 1%

Given that "nearly everyone" was exposed, that value is an order of magnitude too high, should you compare it with how many died the years before covid and during (but before vaccination was generally available) as fraction of the presumably exposed population. All of this is public data, but it probably makes sense to exclude countries with notoriously bad data such as China and India.

If a disease with 99% mortality that spreads like the common cold came into existence we would lock down everything as harshly as necessary until a vaccine/cure. That'd involve stopping all international flights and so on (and all domestic travel, and maybe even going out of your suburb). Covid wasn't deadly enough to justify enforcing the most drastic measures - a 99% mortality rate would justify them to almost everyone.

What if it takes 4-6 years to show symptoms like BSE?

We’d be dead.

That's assuming people are willing to upend their own lives and society at large to stop a virus they've read about on the internet. I'm not optimistic.