The pictures transmitted by the Voyagers showed the two giant planets, and their assorted moons and rings, in unprecedented detail.

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The first Polynesian voyagers used indigenous scientific astronomical knowledge, harnessing the night sky and the environment to guide them across 162 million square kilometres of ocean.

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They are different sorts of voyagers and respond to different influences.

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Zeitlin and his colleagues found voyagers could be exposed to between 554 and 770 millisieverts of ionizing radiation during the trip, depending on the level of solar activity.

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That's the core motivation for 27, 000 voyagers to Omaha, Neb.

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If future testing goes well and "if my wife allows, " Mr. Branson joked, he and his two children plan to be among the first six voyagers to ride the maiden flight of SpaceShipTwo to the edge of space, or about 60 miles above the Earth's surface, at a maximum speed of about 2, 500 miles per hour.

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