Last Updated
：2025/11/28
Quizzes for review
A hypothetical planet sharing an orbit with the earth, but on the opposite side of the sun.
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counter-earth
Some science fiction authors have imagined a counter-earth that shares Earth's orbit but remains hidden on the opposite side of the Sun.
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Some science fiction authors have imagined a counter-earth that shares Earth's orbit but remains hidden on the opposite side of the Sun.
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