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symbo symbo
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7 years ago
In the path of Mars against the background stars shown in Fig. 2-2, Comins and Kaufmann, Discovering the Universe, 7th Ed., the planet appears from Earth to move in a loop, moving westward for a period of time. What is the angle between the Earth–Sun line and the Earth-Mars line when the planet is half-way through the retrograde motion, on about February 1?
   A)  180°    B)  It can be any angle.    C)  0°    D)  90°.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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discovererdiscoverer
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7 years ago
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symbo Author
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7 years ago
This site is awesome
jaray75
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Yesterday
Good timing, thanks!
shangshang
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2 hours ago
this is exactly what I needed
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