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its share of attention owing to these rings.
This led to other discoveries. Huyghens in
1655, and J. D. Cassini in 1671, discovered
the sixth and eighth satellites (Titan and
Japetus). Cassini lost his satellite, and in
searching for it found Rhea (the fifth) in
1672, besides his old friend, whom he lost
again. He added the third and fourth in
1684 (Tethys and Dione). The first and
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