One by one they flickered to life. Venus, first, in 1962, and two and a half years later, Mars. Our spacecraft flew by those planets, orbited them, and became manmade meteors streaking toward the first soil we couldn’t generically call "earth." Later, when we grew ambitious and confident in our abilities, humanity reached for the outer planets, probing Jupiter and Saturn in 1973 and 1979. Each mission turned conjecture into fact...
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