Technology

59534 readers

3199 users here now

This is a most excellent place for technology news and articles.

Our Rules

Follow the lemmy.world rules.
Only tech related content.
Be excellent to each another!
Mod approved content bots can post up to 10 articles per day.
Threads asking for personal tech support may be deleted.
Politics threads may be removed.
No memes allowed as posts, OK to post as comments.
Only approved bots from the list below, to ask if your bot can be added please contact us.
Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 1 year ago

MODERATORS

704

SpaceX's Starlink May Be Keeping the Ozone From Healing, Research Finds (futurism.com)

submitted 5 months ago* (last edited 5 months ago) by Gsus4@programming.dev to c/technology@lemmy.world

187 comments fedilink hide all child comments

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

you are viewing a single comment's thread
view the rest of the comments

[–] AngryCommieKender@lemmy.world -1 points 5 months ago (1 children)

https://en.m.wikipedia.org/wiki/Abundance_of_the_chemical_elements

That article discusses how to determine the average distribution of the elements. Considering that only 2% is not Hydrogen or Helium, I would guess that the amount of aluminum in those meteorites is either not burned up in the atmosphere, or is negligible enough to not make a difference.

[–] Rivalarrival@lemmy.today 5 points 5 months ago

Considering that only 2% is not Hydrogen or Helium

I assume that claim comes from:

The abundance of chemical elements in the universe is dominated by the large amounts of hydrogen and helium which were produced during the Big Bang. Remaining elements, making up only about 2% of the universe

I kind of doubt that hydrogen or helium comprise 98% of the mass of the 48 tons of meteors per day. I kinda suspect that the 48 tons of meteors are comprised almost entirely of "other" elements.