The Kessler syndrome ( also called the Kessler effect , collisional cascading or ablation cascade ) , proposed by the NASA scientist Donald J. Kessler in 1978 , is a scenario in which the density of objects in low Earth orbit ( LEO ) is high enough that collisions between objects could cause a cascade-each collision generating space debris which increases the likelihood of further collisions .
Kessler Syndrome ( or an ablation cascade ) is a thought-up situation made by the NASA scientist Donald J. Kessler in which the amount of space debris in orbit is large enough to cause space collisions to happen often .