Satellite Quiz: How Well Do You Know What's Orbiting Earth?

The space age dawned with the launch of Sputnik 1, Earth's first artificial satellite, in 1957. Thousands of additional spacecraft have followed in Sputnik's footsteps, serving humanity in a variety of ways. How well do you know Earth's satellites?
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A Soviet technician works on Sputnik 1 before the satellite's Oct. 4, 1957 launch.
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