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| | Pluto and Charon |
 | | Because Pluto and Charon are so close to each other (a mere 19,800 km or about 12,200 miles), when the surface ices of Pluto start to sublimate part of its atmosphere may be transferred to Charon. |
 | | Pluto and Charon are so close to each other that they are in synchronous rotation, with a period of 6.387 days (a true tidal lock!). |
 | | With Pluto, Charon, Triton and the other trans-Neptunian (Kuiper Belt) objects, we have a complete picture of our solar system, and a coherent picture of why our solar system looks, acts, and is as it is. |
| www.astro.washington.edu /larson/Astro150b/Lectures/Pluto/pluto_charon.html (832 words) |
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