Launch satellites at the right time to avoid collisions and debris. One-finger game Fast adoption Beautiful design Addictive as hell! The Kessler syndrome (also called the Kessler effect), proposed by NASA scientist Donald J. Kessler in 1978, is a theoretical scenario in which the density of objects in low Earth orbit due to space pollution is high enough that collisions between objects could cause a cascade in which each collision generates space debris that increases the likelihood of further collisions.