la formation du système solaire

A tout a commencer par l’ effondrement d’un gros nuage  . fait de gaz et de poussières .

On estime que l’ univers s’ est formé ils y a 15 milliard d’ année .

Le systèmes solaires qui n’ est qu ‘ une petite partie  de l’ univers  , daté lui 4.5 milliard d’ années .


C e nuage s’ est mis alors a tournoyer dans l’ univers  et s’ est aplatie  en forme de disque .

Les grains de matières situe au centre  se sont agglomérés  donnant  naissance a une étoile une boule brûlante  et lumineuse  le soleil .

 Autour du soleil  ,  les grains  de matières  se sont concentrès  pour formés les noyaux ayant continuer  à tournée .

d’autres poussières  sont venue s’ attacher à eux  .

jusqu ‘ à former les planètes à sol dure’ (dite telluriques)  Mercure , Venus , La Terre  et Mars.

Puis se sont formés les planétes volumineuses  et gazeuses  ; Jupiter , Saturnes  Uranus ,  Néptunes ,  de plus  en plus petites à mesure de leur éloignement du soleil .Cool


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