Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Chimwe chirongwa chaibatanidza kuvakwa kweDigital Orrery naGerry Sussman neboka rake reMIT muna 1988. Boka racho rakashandisa kombiyuta hombe kuti riongorore mafambiro aiita mapuraneti ari kunze kwenyika kwemakore 845 miriyoni (anenge 20 muzana yezera reSolar System). Muna 1988, Sussman naWisdom vakawana mashoko vachishandisa Orrery ayo akaratidza kuti nharaunda yePluto inoratidza zviratidzo zvekusagadzikana, zvichibvawo pamusana pekubatana kwayo neNeptune. Kana nharaunda yePluto isina kugadzikana, saka zvine musoro kuti Solar System yose haina kugadzikana, nokuti muviri mumwe nomumwe, kunyange muduku sePluto, unobata vamwe kusvika pamwero wakati kuburikidza nekubatana kwegravitation.  Mubvunzo: Boka raSussman rakabva kupi?
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