Kessler syndrome
The Kessler syndrome ( also called the Kessler effect , collisional cascading , or ablation cascade ) , proposed by NASA scientist Donald J . Kessler in 1978 , is a theoretical scenario in which the density of objects in low Earth orbit ( LEO ) 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 . 
<triplet> Kessler syndrome <subj> Donald J. Kessler <obj> discoverer or inventor