Abstract

what is the ontology of planets?Our access point to this question is the ontology of planet Earth. Although the presence of life marks planet Earth as special among other planets, Earth shares a basic commonality with them – namely, its material existence. We take this commonality as a point of departure for our reflections on the ontology of both planet Earth and other planets. In this chapter, we ask for the ontology of this materiality of planets. We consult the ontology of planet Earth as I developed it in an earlier contribution (Blok, 2019), explore the ontology of planets as absolute boundary of the natural habitats on Earth, and reflect on the opportunities and limitations such ontology provides for future human colonies on other planets.