Explorer I

20th Century America History 1 of 1 appearances
Practice 20th Century America

"Explorer I" appearances by year

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All 20th Century America clues by year

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# Clue Answer As Given Value Round Category Air Date Show
On January 31, 1958, it became the first U.S. satellite to reach Earth orbit Explorer I $500 J 20th CENTURY AMERICA 1995-12-15 #2600
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