Every now and then I’ll hear about space junk as a Thing To Worry About. Yesterday, the IEEE said “we’ve already passed the tipping point for orbital debris,” complete with a disproportional depiction of Earth surrounded by thousands of pieces of junk that would each have to be the size of New York City to be visible from that range.
Active spacecraft and satellites are increasingly endangered by “the by-product of thousands of launches and routine spacecraft deployments, nearly 200 explosions, and several collisions.” If things get too crowded, collisions will lead to more collisions in a catastrophic feedback loop that will basically be Very, Very Bad For Everyone and Everything.