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

  • FiniteBanjo
    link
    fedilink
    English
    arrow-up
    3
    arrow-down
    2
    ·
    6 months ago

    I feel like it shouldn’t even have to be said out loud that gravity and weight correlate, but their orbit would be heavily impacted by replacing aluminium with five times as much steel for the same durability. You might be able to get away with slightly less if you consider the steel has more heat resistance, but idk.

    • JohnDClay@sh.itjust.works
      link
      fedilink
      English
      arrow-up
      3
      ·
      6 months ago

      Yeah you’d need to put up fewer sats per launch. But they might still have enough lift capacity on starship to do that.

    • Malfeasant@lemmy.world
      link
      fedilink
      English
      arrow-up
      2
      ·
      6 months ago

      Weight does not affect orbit. It affects the amount of fuel needed to reach orbit, and therefore cost, but not the orbit itself.

      • FiniteBanjo
        link
        fedilink
        English
        arrow-up
        1
        arrow-down
        1
        ·
        6 months ago

        Exactly, it needs a higher angular momentum at the same altitude.

    • intensely_human@lemm.ee
      link
      fedilink
      English
      arrow-up
      2
      arrow-down
      1
      ·
      6 months ago

      When there’s drag involved it’s different, but in vacuum there’s no relationship between weight and orbit.

      Are you referring to the effects of upper atmospheric drag on the orbital maintenance requirements?