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| | Chapter 15: Uranus |
 | | Both Caliban and Sycorax, the astronomers write, are unusually red in color, which suggests a link with the recently discovered populations of comet-like bodies called trans-Neptunian objects, which orbit the sun beyond the orbit of Neptune, and Centaurs, which cross the orbits of the outer planets. |
 | | Since the newly discovered moons are likely to have been captured by Uranus soon after its formation, the Nature article notes, "their physical properties may provide clues to conditions in the early solar system." The process of capture could have taken two forms, Nicholson says. |
 | | Sycorax, he estimates, has a diameter of 120 kilometers (74.5 miles), and takes 3.5 years to complete one orbit of Uranus at a mean distance of about 12.2 million kilometers (7.5 million miles) from the planet. |
| www.williams.edu /Astronomy/jay/ETU5/chapter15_5th.html (3430 words) |
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