At the end of their lives, most satellites fall to their death. Many of the smaller ones, including most of those going up as part of the "mega-constellations" currently under construction, are intended to burn up in the atmosphere. This Design for Demise (D4D) principle has unintended consequences, according to a paper published in Acta Astronautica by Antoinette Ott and Christophe Bonnal, both of whom work for MaiaSpace, a company designing reusable launch vehicles for the small satellite market.