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The End of Space Travel?

posted by Jason Kottke   Nov 28, 2018

Remember Alfonso Cuarón’s Gravity? A missile strike on a satellite causes a chain reaction, which ends up destroying almost everything in low Earth orbit. As this Kurzgesagt video explains, this scenario is actually something we need to worry about. In the past 60 years, we’ve launched so much stuff into space that there are millions of pieces of debris up there, hurtling around the Earth at 1000s of miles per hour. The stuff ranges in size from marbles to full-sized satellites. If two larger objects in low Earth orbit (LEO) collided with each other, the resulting debris field could trigger a chain reaction of collisions that would destroy everything currently in that orbit and possibly prevent any new launches. Goodbye ISS, goodbye weather satellites, goodbye GPS, etc. etc. etc. The Moon, Mars, and other destinations beyond LEO would be a lot harder to reach because you’d have to travel through the deadly debris field, particularly with crewed missions.