It's been known for a long time that there's a lot of junk in orbit. If two big pieces hit even more junk is created, all traveling at extremely high speeds. Back in 1978 the NASA scientist Donald Kessler started pointing this problem out and how it could eventually render certain popular orbit uninhabitable by satellites.

On Oct. 16th, 2020 two large pieces of space debris with a combined weight of over 6,000 lbs have (at latest calculation) a 20% of colliding. Close calls like this apparently happen several times a year. A hit wouldn't immediately result in other satellites being destroyed. The effects would be gradual at first but then accelerate as impacts released more and more debris. Normally I'm a big fan of exponential explosions but this sort of cascade could cause far-reaching technological issues. Perhaps Elon Musk should spend some time cleaning up space in addition to launching more stuff.

Anyway, just something else for y'all to think about.
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