ALBUM > SOLEIL
Notre étoiles, le Soleil est née il y a 4,5 milliards d'années par effondrement d'un nuage moléculaire d'Hydrogène et d'Hélium.
C'est une étoile naine de type G2V d'une température de surface de 6000°C et de couleur jaune.
Son intérieur est composé d'un noyau de plasma d'Hydrogène porté à 15 millions de degrés. Autour de ce noyau une zone radiative et une zone convective permettent le transport d'énergie vers l'extérieur. La photosphère matérialise la surface du Soleil.
Notre étoile est aussi composée d'une atmosphère à 2 "étages", la chromosphère et la couronne solaire.
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