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Why does it take too much longer to go to Jupiter and Saturn now then in 70s?

Piooner 10 was launced in March 1972 and it got so much closer to Jupiter than our moon is to Earth in December 1973

Now it takes a hell of longer time to get to Jupiter and Saturn suprisingly

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Voyager 1 launched in 1977, reached near Jupiter in 1979 and near Saturn in 1980
Why does it take too much longer to go to Jupiter and Saturn now then in 70s?
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