2-4 ┊ 2169 words ┊ ◄))
2-4, 2169 words, 18 minutes audio time.
Mars is our next-door neighbor in the solar system, but it still has secrets! From ancient cultures that watched the skies, to modern scientists who send machines into space, humans are passionately curious about the Red Planet. Learn about Mars’ discovery, what it would be like to visit, and what scientists still want to know. Vivid photos, scientist spotlights, and sidebars help unlock the secrets of Mars.
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