A study from the Vikram Sarabhai Space Centre in India reveals that solar activity directly influences the fall of orbital debris. After analyzing 17 objects over 38 years, researchers detected that when sunspots reach 70% of their peak, the rate of debris descent intensifies abruptly.
How solar radiation pushes orbital debris 🌞
The mechanism is simple: increased solar activity heats and expands Earth's atmosphere. This increase in density generates more friction on objects in low orbit, slowing them down and accelerating their re-entry. The data spans from 1986 to 2024 and includes inactive satellites and rocket fragments. The correlation between sunspots and debris fall is clear, although the peaks are not immediate: the effect takes weeks to manifest.
The Sun, that free cosmic garbage collector 🚀
So it turns out our favorite star not only gives us vitamin D and sunburns at the beach, but also helps us clean up the junk we leave floating around. Good thing, because with all the scrap we've put up there, we were about to need an interstellar garbage truck. The Sun, without charging us a cent, does the dirty work for us.