Carl Sagan on the Exploration of Jupiter – The Planetary Society

Beyond Mars lie Jupiter and Saturn.
These were the best views from Earth’s telescopes before Voyager 1 and 2 were
launched. After a two year voyage to Jupiter, they
found a strange and beautiful world with great storm systems larger than the
Earth. They discovered a ring around Jupiter and saw for the first time the
surfaces of its four large moons. Battered Callisto, its craters filled
with gleaming ice. Ganymede, bearing the marks of ancient geological activity.
Europa, it’s cracked icy surface perhaps covering an underground ocean of liquid
water. And most astounding of all, Io. On
Io we discovered multicolored frozen lakes of liquid sulfur, active volcanoes,
and geysers reaching directly into space.

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