 Another major issue is the amount of radiation to which a space probe is subjected , due to the harsh charged @-@ particle environment around Jupiter ( for a detailed explanation see Magnetosphere of Jupiter ) . For example , when Pioneer 11 made its closest approach to the planet , the level of radiation was ten times more powerful than Pioneer 's designers had predicted , leading to fears that the probes would not survive . With a few minor glitches , the probe managed to pass through the radiation belts , but it lost most of the images of the moon Io , as the radiation had caused Pioneer 's imaging photo polarimeter to receive false commands . The subsequent and far more technologically advanced Voyager spacecraft had to be redesigned to cope with the radiation levels . Over the eight years the Galileo spacecraft orbited the planet , the probe 's radiation dose far exceeded its design specifications , and its systems failed on several occasions . The spacecraft 's gyroscopes often exhibited increased errors , and electrical arcs sometimes occurred between its rotating and non @-@ rotating parts , causing it to enter safe mode , which led to total loss of the data from the 16th , 18th and 33rd orbits . The radiation also caused phase shifts in Galileo 's ultra @-@ stable quartz oscillator . 
 Another major issue <a href='drop_aux' title='1'><mark>is</mark></a>the amount of radiation to which a space probe is subjected , due to the harsh charged @-@ particle environment around Jupiter ( for a detailed explanation see Magnetosphere of Jupiter ) . For example , when Pioneer 11 made its closest approach to the planet , the level of radiation was ten times more powerful than Pioneer <a href='null_genetive' title='2'><mark>'s</mark></a>designers <a href='been_done' title='3'><mark>had</mark></a> predicted , leading to fears that the probes would not survive . With a few minor glitches , the probe managed to pass through the radiation belts , but it lost most of the images of the moon Io , as the radiation <a href='been_done' title='4'><mark>had</mark></a> caused Pioneer <a href='null_genetive' title='5'><mark>'s</mark></a>imaging photo polarimeter to receive false commands . The subsequent and far more technologically advanced Voyager spacecraft had to be redesigned to cope with the radiation levels . Over the eight years the Galileo spacecraft orbited the planet , the probe <a href='null_genetive' title='6'><mark>'s</mark></a>radiation dose far exceeded its design specifications , and its systems failed on several occasions . The spacecraft <a href='null_genetive' title='7'><mark>'s</mark></a>gyroscopes often exhibited increased errors , and electrical arcs sometimes occurred between its rotating and non @-@ rotating parts , causing it to enter safe mode , which led to total loss of the data from the 16th , 18th and 33rd orbits . The radiation also caused phase shifts in Galileo <a href='null_genetive' title='8'><mark>'s</mark></a>ultra @-@ stable quartz oscillator . 
Anotha major issue da amount of radiation to which a space probe is subjected , due to the harsh charged @-@ particle environment around Jupiter ( fir a detailed explanation see Magnetosphere of Jupiter ) . For example , when Pioneer 11 made its closest approach to tdaplanet , the level of radiation was ten times more powerful den Pioneer  designers done predicted , leading to fears that the probes would not survive . With a few minor glitches , thdarobe managed to pass through the radiation belts , but it lost most of the images of the moon Io , as thedadiation done caused Pioneer  imaging photo polarimeter to receive false commands . The subsequent and far more technologically advanced Voyager spacecraft had to be redesigned to cope wid the daiation levels . Over the edat years the Gadaeo spacecraft orbited the planet , the probe  radiation dose far exceeded its design specifications , and its systems failed on several occasions . The spadaraft  gyroscopes often exhibited increased errors , and electrical arcs sometimes occurred between its rotating and non @-@ rotating parts , causing it to enter safe mode , which led to total loss of the datadaom the 16th , 18th and 33rd orbits . The radiation also caused phase shifts in Galileo  ultra @-@ stable quartz oscillator .