Discussion
What is the first artificial satellite to orbit Earth ?
Answer: A
The first artificial satellite was Sputnik 1.
The Soviet Union launched Sputnik 1 on 4 October 1957. It orbited Earth for about three months and began the space age.
Explorer 1 (January 1958) was the first American satellite, Vanguard 1 (March 1958) the second American one, and Discoverer 1 (1959) was an early US reconnaissance programme satellite. All came after Sputnik.
Sputnik 1 was a polished metal sphere about 58 cm across with four radio antennas, and its radio beeps could be picked up by amateur operators around the world.
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