Science Fiction
Tethered
In 1978, NASA astrophysicist Donald J. Kessler predicted that the quantity of artificial satellites orbiting Earth would reach a critical limit, after which collisions became inevitable. One satellite would strike another at the dangerous speeds of Earth orbit—seven, eight kilometers per second—and the two would break into hundreds of pieces. These pieces would in turn collide with other satellites, generating a chain reaction of impact and debris.