SpaceX's Starlink May Be Keeping the Ozone From Healing, Research Finds
SpaceX's Starlink May Be Keeping the Ozone From Healing, Research Finds
SpaceX's growing Starlink megaconstellation could be hindering the Earth's ozone layer from healing itself, researchers find.
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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You would think space engineers would‘ve run those numbers before sending tens of thousands of them in orbit. It‘s really annoying that we can only hope for the best at this point.
I fully expect they did. I think this is partly why Elon went from "there's no planet B" to a Saudi simp. Way to much money to be made to waste time on the concerns of scientists and the welfare of the planet.
I was just worried about Kessler syndrome and just felt relaxed that their orbits were low enough to naturally decay and never become a permanent problem. What this research seems to show is that the aluminum oxide dust does not settle in days/weeks, but it is fine enough to stay there for decades :/
Wood is interesting, but the article doesn't address off gassing at all, which is a huge problem for communication satellites. Is there a way to keep the wood from off gassing? For 3d prints in vacuum, they metal coat them to keep the gas inside. Or maybe you could resin soak them? With hopefully an extremely UV stable resin. But I didn't know what the weight trade looks like then, resin is heavy.
But if you're looking composites anyway, carbon fiber would be another great option. Lightweight but with a few manufacturing constraints. But should burn up to carbon dioxide on reentry.
Why would you think that?
When I fire up the grill, I don't do calculations on how much weight in CO2 I'm putting into the air and then extrapolate that to find the total mass of CO2 that grills generate globally. I usually just make burgers.
That space engineer made sure that they were on the right side of the rocket equation and they made it to orbit (which is hard on its own).
I agree that thorough environmental studies really ought to be happening, but I'm not surprised that aspects got missed.
They do, and did. Perhaps this reaction with the ozone layer just hasn't been considered until now.
it's not just musk, Bezos too.