#accaddeoggi 13 marzo 1781: scoperto il pianeta Urano

Il gigante ghiacciato

Il 13 marzo del 1781 l'astronomo britannico di origine tedesca William Herschel scoprì, grazie ad un telescopio da lui costruito, il settimo pianeta del Sistema Solare, Urano, che fino a quel momento era stato ritenuto erroneamente una stella.

L'astronomo riuscì a smentire questa credenza, accorgendosi del fatto che l'orbita che il pianeta percorreva era diversa dal percorso compiuto da una stella.

Urano, con un diametro 4 volte più grande di quello della Terra, porta il nome del dio greco del cielo e la sua atmosfera è la più fredda del Sistema Solare, contenente, oltre idrogeno ed elio, grandi quantità di acqua, ammoniaca e metano, la cui presenza fa apparire Urano di colore blu.

Urano e Nettuno: i giganti ghiacciati

redazione
parte di: Accadde oggi ...

13/03/2017

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