In October 1957, the Soviet Union launched Sputnik 1, the world's first artificial satellite. The 184-pound, 22.5-inch sphere orbited the earth once every 96 minutes. Sputnik transmitted radio signals for 21 days and later burned up in the earth's atmosphere. A second Sputnik, launched in November 1957, carried a dog named Laika. This satellite weighed a thousand pounds.

Concepts

sputnik, the space race

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Additional Tags

apollo 1, space program

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Classroom Considerations

• Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)

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