
O echipă internaţională de astronomi a cercetat şi a aflat care este durata unei zile pe Saturn. După ce au scăzut cu cinci minute durata mişcării de rotaţie a giganticei planete aceştia au aflat că o zi pe Saturn durează nici mai mult, nici mai puţin de 10 ore, 34 de minute şi 13 secunde.
Durata mişcării de rotaţie a planetelor gazoase este mai dificil de calculat decât cea a planetelor telurice, precum Terra, Marte sau Venus, din cauza absenţei punctului de reper fix pe suprafaţa lor.
Astronomii au utilizat până acum câmpul magnetic al lui Saturn, însă acesta fluctuează şi nu poate indica precis durata rotaţiei. Echipa condusă de oameni de ştiinţă de la universităţile Oxford şi Louisville a recurs la imagini în infraroşu surprinse de sonda americană Cassini, pe orbită în jurul lui Saturn.
Diferenţa de cinci minute nu este fără consecinţe pentru astronomi. „Aceasta înseamnă că vremea de pe Saturn seamănă mai mult cu cea de pe Jupiter şi că aceste două planete gigantice sunt mai asemănătoare decât credeam până acum”, a declarat Peter Read, unul dintre autori.
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