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4e univers

Amas regroupement de galaxies
Galaxie regroupement de plusieurs 10aines d'étoiles
année lumière distance parcourue par la lumière en 1 an soit ~ 10 m
Macroscopique = que l'on peut voir à l’œil nu (inverse) Microscopique = que l'on ne peut pas voir à l’œil nu (inverse)
Terre (composition ?) Fer (Fe) ; Oxygène (O) ; Silicium (Si) (planète ?)
les 2 gaz les plus abondants de l'univers Hélium (He) et Dihydrogène (H )
Théorie du big bang naissance de l'univers avec une violente expansion
Created by: eraxit