skrywer: Guest
Opgelaai by: 2014.11.27 00:09
Inhoudstipe: image/svg+xml; charset=utf-8
krediete: By Malyszkz (Own work) [Public domain], via Wikimedia Commons
Bron: https://upload.wikimedia.org/wikipedia/commons/1/13/Closed_orbits_shapes.svg
Adult only: false