Pourquoi la couronne solaire est 1000 fois pl...

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Qu'est-ce que le rayonnement de Hawking ?

Un trou noir porte plutôt mal son nom. Car selon la physique moderne, il n’est pas complètement noir : il peut émettre un très faible rayonnement.C’est ce qu’on appelle le rayonnement de Hawking, du nom du physicien britannique Stephen Hawking, qui en a proposé le mécanisme en 19 ... Show more

. 2min 48sec

Pourquoi les avions de ligne volent-ils tous autour de 11 000 mètres ?

Quand on regarde l’altitude d’un avion de ligne en plein vol, on retrouve presque toujours le même ordre de grandeur : environ 10 000 à 12 000 mètres.Pourquoi ne pas monter beaucoup plus haut, à 15 ou 20 kilomètres, afin de profiter d’un air encore moins dense ?Parce qu’autour de ... Show more

. 2min 19sec

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