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doit_the_clown doit_the_clown
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7 years ago
What is unique about the Pluto-Charon system, compared to all other planets in the solar system?
A)   Both Pluto and Charon are volcanically active, with lava flows and vents of sulfur dioxide gas.
B)   Charon is an icy moon, but it is in orbit around a giant planet made mostly of liquid hydrogen.
C)   Pluto has only one satellite.
D)   Both Pluto and Charon are in synchronous rotation, so each object maintains the same face toward the other object at all times.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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doit_the_clown Author
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7 years ago
Thanks
Smair87
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Yesterday
Good timing, thanks!
TheMoffattMan
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2 hours ago
Smart ... Thanks!
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