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1. quizlet.com › 641140546 › astro-midterm-2-review-flash-cardsAstro Midterm 2 Review Flashcards | Quizlet

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   • Αποθηκευμένο αντίγραφο

   Mars must be in retrograde. During the period each year when we see Mars undergoing apparent retrograde motion in our sky, what is really going on in space? Earth is catching up with and passing by Mars in their respective orbits.