In the last sixty years, space activity has increased exponentially. Satellites in orbit are used for countless purposes and they represent a unique resource for collecting scientific data and for creating new commercial opportunities and various essential applications and services. However, as a consequence of this progressive growth , a new hazard has become a concrete reality: space debris. The great presence of space debris around Earth, and its continuous rise in number and mass, represents a big deal for active and future space missions, due to possible fatal collision, to the point that the majority of space agencies are busily dealing with the problem.