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The discovery of Uranus in 1781 by William Herschel is compared with discoveries by Voyager 1 and Voyager 2 of additional moons for the outer planets, especially Uranus. Shows photographs of the moon and the...
NASA’s Jet Propulsion Laboratory proposed a mission in the 1960s to send spacecraft to the giant outer planets Jupiter, Saturn, Uranus and Neptune. In 1977 Voyagers 1 & 2 were launched. The leading...
There are currently nine known planets in the solar system. Mathematics of planetary motion predicts a tenth, outer planet and observations of the orbits of Neptune support this theory. Looks at the...
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