They orbit between our planet and our star. Mercury and Venus make up half of our terrestrial planets, but we still know very little about them. As we take a closer look at our companions, we find more questions than answers.
They orbit between our planet and our star. Mercury and Venus make up half of our terrestrial planets, but we still know very little about them. As we take a closer look at our companions, we find more questions than answers.
Episode Discussion
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