October 4, 1957
Soviet scientists launched the first man-made satellite, Sputnik I. The 184-pound sphere circled the earth approximately every 11/2 hours at an altitude of 140 to 560 miles above the earth.
Soviet scientists launched the first man-made satellite, Sputnik I. The 184-pound sphere circled the earth approximately every 11/2 hours at an altitude of 140 to 560 miles above the earth.