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R136a1, en plus d'être l'étoile la plus massive
connue, est aussi la plus lumineuse. Sa puissance
radiative Pétoile
est environ 8 710 000 supérieure à celle du
Soleil. Cette étoile émet ainsi plus d'énergie lumineuse en
quatre secondes que le Soleil en une année.
1. Sachant que la puissance radiative du Soleil est égale à
3,87 X 1026 W, calculer la puissance radiative P de l'étoile
R136a1.
étoile
2. Quelle masse cette étoile perd-elle chaque seconde à
cause de son rayonnement ?
3. Contrôler l'exactitude de la dernière phrase de l'énoncé

Sagot :

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