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PIX4605806 Voyager 2 probe near Uranus - Voyager 2 spacecraft near Uranus - Artwork - In 1986, the Voyager 2 probe orbited around Uranus. In this artist's view, Uranus's rings and some of its satellites are represented. In 1986 Voyager 2 flew past Uranus and its dark rings, providing a once in a lifetime closeup view of this cold world. Two of its moons are also visible in this view
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PIX4634804 Uranus and its satellite Puck - Illustration - Uranus from Puck orbit - Illustration - The planet Uranus seen from the orbit of its small satellite Puck. This is how Uranus and its tiny satellite Puck might look from a position in orbit around Puck. Puck in turn orbits Uranus at a height of 37 thousand miles above Uranus' cloud tops, completing one orbit in about 18 hours. Due to the fact that Puck's orbit is on the same plane as Uranus' rings, they would appear as little more than a thin line from this vantage punin
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PIX4634800 Uranus - Illustration - The planet Uranus and its system of rings. This image suggests how Uranus might look from a position in space several hundred thousand miles above its south pole. Like Saturn and Jupiter, Uranus is a Gas Giant, composed primarily of hydrogen and helium gases surrounding a relatively small, dense core of molten rock and metal. Its bluish color is due to the presence of methane in its upper atmosphere. Also like Saturn and Jupiter, Uranus has rings. However Uranus' rings are over three orders of magnitude dimmer than Saturn's; where Saturn's rings are almost white, Uranus' rings are more like the color of charcoal. Uranus 'rings are so dim that they went undetected from 1781, when the English astronomer William Herschel first observed Uranus through a telescope, until 1977 when astronomers watched as a star passing behind Uranus appeared to blink several times, caused by the ten rings surrounding the planet. One bizarre aspect of Uranus is that its axis of rotation is tipped beyond 90 degrees in relation to the plane of its orbit around the Sun. This puts Uranus' north and south poles, relative to the Sun, where the other planets have their equators
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PIX4624079 Neptune - Illustration - Artist's view of Neptune with its ring system and large dark spot observed by the Voyager 2 probe in 1989. This image suggests how Neptune might look from a position in space above the plane of its rings. Like Uranus, Neptune is a Gas Giant, composed primarily of hydrogen and helium gases surrounding a relatively small, dense core of molten rock and metal. Also like Uranus, Neptune has charcoal - colored rings, although they appear to be fewer in number than Uranus's. While Neptune's diameter is slightly less than Uranus ', it has more mass. Neptune's blue color is due to the presence of methane in its upper atmosphere. The dark spot in the southern hemisphere beneath the rings, dubbed “” The Great Dark Spot,””” is believed to be a giant storm which was active in 1989 when Voyager 2 photographed Neptune. Just beyond the rings at Neptune's 7 o'clock position, barely discernable from the background stars, is the tiny satellite Proteus. With an average diameter of 260 miles, Proteus is the second - largest of Neptune's eight known satellites (a distant second compared to Neptune's largest satellite Triton which has a diameter of 1,677 miles)
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