What was Earth’s first artificial satellite?
A Explorer 1
B Sputnik 1
C Ariel 1
Sputnik 1, a historic achievement launched by the Soviet Union on October 4, 1957, was the first artificial satellite of Earth. It was 58 centimetres in diameter, weighed about 83 kilograms at launch and stayed in orbit for three months.
The correct answer is Sputnik 1.