On the hazards of small space debris

The history of progressive near-Earth space (NES) contamination with large and small space debris (SD) is analyzed as well as the causes and consequences of this phenomenon for space activity and ecology of the Earth and NES. The amount, mass, and dynamics of the small orbital debris population in low Earth orbits (LEO) are estimated as well as the consequences of multi-satellite communication space systems deployment being planned now. The latter makes the study of this area particularly relevant. Various aspects of the consequences of technogenic contamination of NES are considered, as well as the danger of small space debris for space activities and the ecology of the Earth and near-Earth space in comparison with the danger of large debris. A significant lack of complete and reliable information about small SD due to a shortage of sensors that can observe it is substantiated, which is one of the main reasons for the paucity of our knowledge about this population of SD. Based on a talk presented at the XI International Conference "Near-Earth Astronomy and Space Heritage" (Sep 30 - Oct 4, 2019, Kazan, Russia).