Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Muenzaniso wakajairika wokugadzirwa kweSystem yeSolar (kusanganisira Pasi) ndiyo solar nebula hypothesis. Mumuenzaniso uyu, Solar System yakaumbwa negore guru rinotenderera reguruva negasi zvinonzi solar nebula. Yakanga yakaumbwa nehydrogen nehelium zvakagadzirwa nguva pfupi pashure peBig Bang 13.8 Ga (mabhiriyoni emakore akapfuura) uye zvinhu zvinorema zvakabudiswa ne supernovae. Makore anenge 4.5 Ga, nebula racho rakatanga kuderera zvichida nemhaka yemafungu anokonzerwa nesupernova yaiva pedyo. Gomba rinorova ringadai rakaitawo kuti nebula itenderere. Sezvo gore racho rakatanga kukurumidza, simba raro rinotenderera, giravhiti, uye kusaita basa kwaro zvakarirovera kuva dhisiki repurotoplanetary rakatwasuka kune axis yaro yokutenderera. Zvikanganiso zviduku zvinokonzerwa nokurwisana uye simba rinotenderera remamwe matombo makuru zvakagadzira nzira iyo mapuraneti makuru akareba makiromita akatanga kuumbwa, achitenderera nepakati pebhaira. Pakati pebhaira, risina simba rinotenderera rakawira pasi nokukurumidza, kudzvinyirira kuchipisa kusvikira kubatanidzwa kwenyukireya yehydrogen kuita helium kwatanga. Pashure pokuwedzera kupfupika, nyeredzi yeT Tauri yakavheneka ndokuchinja kuva Zuva. Munguva iyi, muchikamu chokunze cheiyo nebula simba rinokwevera zvinhu pasi rakaita kuti zvinhu zvinyorovedzane zvakapoteredza zvinokanganisa uwandu hwezvinhu uye zvikamu zveguruva, uye zvimwe zvose zveprotoplanetary disk zvakatanga kuparadzana kuva mhete. Munzira inonzi runaway accretion, zvidimbu zvakakura zveguruva nemarara zvakaungana pamwe chete kuti zvive mapuraneti. Pasi rakaumbwa nenzira iyi makore anenge mabhiriyoni 4,54 akapfuura (pasina chokwadi che1%) uye rakapedzwa zvikurukuru mukati memakore 10<unk>20 mamiriyoni. Mhepo yezuva yenyeredzi ichangobva kuumbwa yeT Tauri yakabvisa zvinhu zvakawanda zvaiva mudhisiki zvakanga zvisati zvanyatsopinda mumiviri mikuru. Nzira imwe cheteyo inotarisirwa kubudisa ma disc okuwedzera akapoteredza nyeredzi dzose dzichangobva kuumbwa muchadenga, dzimwe dzacho dzinobereka mapuraneti. Nyika yokutanga yakakura nokuwedzera kusvikira mukati mayo mava kupisa zvakakwana kuti inyungudise simbi dzinorema, dzinodikanwa nesiderophile. Zvazvaiva zvakasimba kupfuura silicates, simbi idzi dzakanyura. Izvi...  Mubvunzo: Rakanga rakaumbwa nezvinhu zvipi zviviri?
hydrogen nehelium