** CE230. [[La gran actividad volcánica de Io indica una edad temprana]].
** CE231. [[Jupiter and Saturn are cooling too rapidly to be old]].
** CE240. [[Saturn's rings are unstableLos anillos de Saturno son inestables]].
** CE260. [[Three planets and several moons revolve backwards]].
*** CE260.1. [[El movimiento retrógrado de los planetas refuta el big bang]].