 Ganymede is the Solar System 's largest moon and the Solar System 's only known moon with a magnetosphere , but this does not shield it from cosmic radiation to a noteworthy degree , because it is overshadowed by Jupiter 's magnetic field . Ganymede receives about 0 @.@ 08 Sv ( 8 rem ) of radiation per day . Callisto is farther from Jupiter 's strong radiation belt and subject to only 0 @.@ 0001 Sv ( 0 @.@ 01 rem ) a day . For comparison , the average amount of radiation taken on Earth by a living organism is about 0 @.@ 0024 Sv per year ; the highest natural radiation levels on Earth are recorded around Ramsar hot springs at about 0 @.@ 26 Sv per year . 
 Ganymede <a href='drop_aux' title='1'><mark>is</mark></a>the Solar System <a href='null_genetive' title='2'><mark>'s</mark></a>largest moon and the Solar System <a href='null_genetive' title='3'><mark>'s</mark></a>only known moon with a magnetosphere , but this <a href='uninflect' title='4'><mark>does</mark></a> not shield it from cosmic radiation to a noteworthy degree , because it is overshadowed by Jupiter <a href='null_genetive' title='5'><mark>'s</mark></a>magnetic field . Ganymede <a href='uninflect' title='6'><mark>receives</mark></a> about 0 @.@ 08 Sv ( 8 rem ) of radiation per day . Callisto <a href='drop_aux' title='7'><mark>is</mark></a>farther from Jupiter <a href='null_genetive' title='8'><mark>'s</mark></a>strong radiation belt and subject to only 0 @.@ 0001 Sv ( 0 @.@ 01 rem ) a day . For comparison , the average amount of radiation taken on Earth by a living organism is about 0 @.@ 0024 Sv per year ; the highest natural radiation levels on Earth are recorded around Ramsar hot springs at about 0 @.@ 26 Sv per year . 
Ganymede da Solar System  largest moon and the Solar System  only known moon witt a magnetosphere , but dis do not shield it from cosmic radiation to a noteworthy degree , cuz it is overshadowed by Jupiter  magnetic field . Ganymede receive bout 0 @.@ 08 Sv ( 8 rem ) of radiation per day . Callisto farther from Jupiter  strong radiation belt and subject to only 0 @.@ 0001 Sv ( 0 @.@ 01 rem ) a day . For comparison , the average amount of radiation taken on Earth by a living organism is about 0 @.@ 0024 Sv per year ; the highest natural radiation levels on Earth r recorded around Ramsar hot springs at abou0 @.@ 26 Sv per year .