On Dec. 31, 2004, NASA’s Cassini spacecraft flew by Iapetus, Saturn’s third largest moon. Iapetus was discovered by the Italian astronomer Giovanni Cassini in 1671. NASA’s Cassini craft flew by the ...
Iapetus is one of Saturn’s most puzzling moons, marked by an extreme contrast between a dark hemisphere and a bright one. Adding to the mystery is a massive equatorial ridge that wraps around much of ...
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