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Read the text and answer the questions 19-22
Two space-crafts took off from the USA in 1977. Voyager I and Voyager II started a long and difficult journey. Voyager I arrived at Jupiter, the largest planet in the solar system. Scientists received the best photographs of the planet from Voyager I and they discovered a lot of information about the planet’s cruel weather. Jupiter also has a moon with volcanoes. Voyager I’s next stop was Saturn. Saturn is smaller than Jupiter and it’s most famous for its rings. Voyager II also visited Jupiter and Saturn after Voyager I, but then it continued to Uranus. There was a lot of ice on the surface of Uranus. During its journey round Uranus, there were mechanical problems with Voyager II’s camera. Eventually, scientists fixed it and Voyager II