The choices below describe four hypothetical planets. Which one would you expect to have the hottest interior? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: twice as big as Earth. Distance from Sun: same as Mercury. Rotation rate: once every 6 months.
B) Size: same as the Moon. Distance from Sun: same as Mars. Rotation rate: once every 10 days.
C) Size: same as Mars. Distance from Sun: same as Earth. Rotation rate: once every 18 hours.
D) Size: same as Venus. Distance from Sun: same as Mars. Rotation rate: once every 25 hours.
Correct Answer:
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