Technology

59534 readers

3195 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

[–] volodya_ilich@lemm.ee -1 points 5 months ago (3 children)

At least they're not blowing their budget exploding rockets...

[–] sunbeam60@lemmy.one 8 points 5 months ago (1 children)

No they’re somehow managing to blow it neither launching nor exploding rockets.

[–] intensely_human@lemm.ee 1 points 5 months ago

They’re blowing it on extra helium to make up for all the blowing helium

[–] CookieOfFortune@lemmy.world 6 points 5 months ago (1 children)

And the lesson is that they probably should’ve blown up more rockets on purpose rather than lose them on accident.

The Falcon 9 has the largest number of successful launches of any rocket ever by a large margin.

[–] volodya_ilich@lemm.ee 0 points 5 months ago (2 children)

on purpose

lol

[–] sunbeam60@lemmy.one 3 points 5 months ago (1 children)

I mean you can giggle at the turn of phrase, but clearly what is meant is to be more willing to tolerate risk. Very clearly that’s been a much shorter path to success than the one NASA took.

[–] intensely_human@lemm.ee 2 points 5 months ago

You can be more direct with it. Going out and doing something you know will fail is failing on purpose. SpaceX fails on purpose sometimes. They don’t just tolerate the risk of it; they set up cameras and other sensors and push their systems to failure on purpose.

[–] intensely_human@lemm.ee 1 points 5 months ago

Another example of failing on purpose is when you do push-ups until the point of collapse.

[–] afraid_of_zombies@lemmy.world 3 points 5 months ago

I am pretty sure they are making lots of money. You know based on the little bit of financial information leaking out.

Lots of people are experts on this topic it seems. They should form their own launch provider and show how it is done. Because results generally speak for themselves. They went from nothing to controlling over half the launches of the human race as a whole in about a decade. Did they get government money? Oh you betcha. Did they get as much as their rivals did? Not even close.

Reusability makes sense, this technique of rapid trial and error also makes sense.