this post was submitted on 20 Jun 2024
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https://en.wikipedia.org/wiki/Hyperoxia

This was a screenshot I took months ago while watching a Geology Hub upload on YT. It was a lightbulb moment for my understanding of mass extinction events, (the largest was 250ma). I've referenced this multiple times, so thought I might share. Perhaps you find it as interesting as I do.

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[–] Tar_alcaran@sh.itjust.works 2 points 2 months ago (2 children)

You can absolutely breathe higher partial oxygen pressure unaided for a long time. Hyperoxia isn't all that lethal and definitely not quickly, if you're only visiting, there's no problem.

And if you want to live there, you should be much more worried about all the brand new diseases you don't have immunity to, or the bugs that are bigger than you.

The low oxygen is definitely a problem, especially if you need to run away from the stuff mentioned above.

[–] Dasus@lemmy.world 1 points 2 months ago

Also someone like a proper Sherpa sherpa from the Himalayas can function with oxygen that's comparable to 7% sea level oxygen.

And there are towns with elevation so high the oxygen is equivalent to 15% sea level oxygen.

So this chart has pretty narrow limits. Sure, the legend does specify "breathe forever unaided", but someone like a well accustomed sherpa who regularly climbs Mt Everest would have a much wider range than 20-25%

[–] MonkderDritte@feddit.de 0 points 2 months ago

you should be much more worried about all the brand new diseases you don't have immunity to

The diseases of amphibians, who are likely similiar to something you inherited from your mother already?

[–] Arigion@feddit.de 0 points 2 months ago

I read "space farting civilization". That is an interesting concept.

[–] Beryl@lemmy.world 0 points 2 months ago* (last edited 2 months ago) (1 children)

There are 850k people living in La Paz, Bolivia (elevation 3650m) with the equivalent of 13.2% sea level oxygen and they seem to be doing just fine. And granted, the natives of the region display some hemoglobin adaptation, but still... Even Aspen, Colorado sits at about 15% sea level oxygen and I'm pretty sure people don't wear breathing gear while skiing there.

[–] MonkderDritte@feddit.de 0 points 2 months ago* (last edited 2 months ago)

Though you start to notice it around 2500m, as a untrained person.

[–] Dark_Dragon@lemmy.dbzer0.com 0 points 2 months ago (1 children)

I'm just stuck at how to calculate the Earth's rotation with the current cosmic expansion; turns out, combining galactic rotations and universal expansions isn't as simple as you'd think! After that I'm off towards time traveling.

[–] j4k3@lemmy.world 0 points 2 months ago (1 children)

Problem with time travel is all the miscalculations trying to hit the thin skin of a moving object. Don't forget the undulations through the galactic arms and the effect of the galactic medium against the heliopause. Good luck! Never know, maybe you'll be the first above ground and non orbital. Bring a parachute, ablation shield, a shovel, and say hello to Hawking!

P.S. If you get a chance, tell me to call in sick for work 2/26/14. I'd appreciate not being disabled in that alt timeline. Thx!

[–] ininewcrow@lemmy.ca 0 points 2 months ago (1 children)

A safer solution would be to just purposely target your arrival to the other side in empty space. While also travelling in a fully functional spaceship. Just make sure your little ship arrives within a set distance to Earth otherwise you will have to figure out how to travel millions of kilometers to get to where you're going. If technology gets to the point of developing safe time travelling, I'll assume that the same level of technology should be able to develop a space ship.

[–] Tlaloc_Temporal@lemmy.ca 1 points 2 months ago

Even easier, send fast-return probes to collect a hard record of locations. Who cares if your prediction models are to chaotic? We've already seen the destination!

[–] aramis87@fedia.io 0 points 2 months ago (1 children)
[–] AngryCommieKender@lemmy.world 0 points 2 months ago* (last edited 2 months ago) (1 children)

Yep. ~~Dragon~~ Gryphonflys that had around a foot / 30 cm wingspan, and underwater scorpions that were 18 feet / 6 meters long including the tail.

[–] aramis87@fedia.io 0 points 2 months ago (1 children)

Okay, yeah, thanks for that nightmare ....

[–] Geobloke@lemm.ee 1 points 2 months ago (1 children)

Well to be fair squid get much bigger than 6 metres

[–] aramis87@fedia.io 1 points 2 months ago

True. But for the most part, squid are also not chittering outside at night, banging on the windows trying to get in.