"The Trash Cage - How a cloud of junk could trap humanity on Earth forever" investigates the "Kessler Syndrome," a theoretical scenario proposed by NASA scientist Donald Kessler in 1978. It suggests that once the density of objects in low Earth orbit is high enough, collisions between objects could cause a cascade: one satellite hits another, creating thousands of shrapnel pieces, which hit other satellites, creating a chain reaction.Science writer David Junk describes the terrifying result: a shell of debris moving at 17,500 mph that destroys everything in orbit and makes leaving the planet...