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 .
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