Planeta duplo: diferenças entre revisões
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==References==
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* "[[Clyde Tombaugh]] (1906-97) Astronomer who discovered the Solar System's ninth planet", ''[[Nature (journal)|Nature]]'' 385 (1997) 778 (Pluto and Charon are "the only known example of a true double planet".){{en icon}}
* "It's not easy to make the Moon", ''Nature'' 389 (1997) 327 (comparing double planet theory of Moon formation and Pluto-Charon as double planet) {{en icon}}
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