this post was submitted on 17 Jun 2024
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Abstract from the paper in the article:

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GL109280

Large constellations of small satellites will significantly increase the number of objects orbiting the Earth. Satellites burn up at the end of service life during reentry, generating aluminum oxides as the main byproduct. These are known catalysts for chlorine activation that depletes ozone in the stratosphere. We present the first atomic-scale molecular dynamics simulation study to resolve the oxidation process of the satellite's aluminum structure during mesospheric reentry, and investigate the ozone depletion potential from aluminum oxides. We find that the demise of a typical 250-kg satellite can generate around 30 kg of aluminum oxide nanoparticles, which may endure for decades in the atmosphere. Aluminum oxide compounds generated by the entire population of satellites reentering the atmosphere in 2022 are estimated at around 17 metric tons. Reentry scenarios involving mega-constellations point to over 360 metric tons of aluminum oxide compounds per year, which can lead to significant ozone depletion.

PS: wooden satellites can help mitigate this https://www.nature.com/articles/d41586-024-01456-z

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[–] nevemsenki@lemmy.world 48 points 4 months ago (5 children)

Ah yes, the usual method of waiting until the issue becomes confirmed and also way too severe to fix instead of acting on precaution and harming profits of private companies. What could go wrong?

[–] puchaczyk@lemmy.blahaj.zone 35 points 4 months ago (1 children)

Yeah, PFAS comes to mind. It took decades to confirm it's harmful to humans but at this point it is everywhere and hard to get rid of. Worst part is they try to use other chemicals to replace PFAS, but again how harmful they are we don't know and we will learn that decades later too because companies don't want to make long term research before releasing the product. Enviroment shouldn't be a billionaire's testing ground.

[–] intensely_human@lemm.ee 1 points 4 months ago

So if moving from PFAS to alternate chemicals means moving foolishly into untested chemicals, why didn’t they wait to test them? Were they forced to make the change?

[–] nialv7@lemmy.world 7 points 4 months ago (1 children)

There is a line somewhere I think. Like people weren't 100% sure the atomic bomb won't ignite the atmosphere (it's only very unlikely), but they still tested it. Similarly the probability of creating micro blackholes at LHC is not zero either, yet they still ran it.

If we have to make sure everything is 100% safe before we can do anything, we will be stuck with the status quo.

[–] intensely_human@lemm.ee 2 points 4 months ago

We will die of starvation because nothing is 100% safe, so waiting until we find that level of safety means we just won’t do anything.

[–] afraid_of_zombies@lemmy.world 1 points 4 months ago

I don't know how that is usual in your mind. Since from my perspective I see it constantly.

[–] Cocodapuf@lemmy.world 0 points 4 months ago

As opposed to acting before you understand the effects of your actions? Neither seem like good choices.

Probably the best option would be to research harder. Make the polluter fund a much larger scale research program to understand the problem and viable solutions as quickly as possible.