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A general introduction to the topic of space, for young children. This installment, part 2 of 4, introduces the solar system and the terrestrial planets in particular (part 3 covers the rest of the solar system). Topics in this installment include the relative sizes of the planets, terrestrial vs. gas giant planets, how the planets appear in the night sky, telescopes and space probes, Mercury, Venus, Earth, and especially Mars, and their various features.