Sputnik Now

: It completed 1,440 orbits over three months before burning up in the atmosphere on January 4, 1958. 2. Sputnik News Agency

: It was a 58 cm polished metal sphere with four external antennas. Its primary mission was to test the placement of a satellite into orbit and measure atmospheric density. Sputnik

: It broadcasted a distinctive radio signal at 20 MHz and 40 MHz that was picked up by amateur radio operators worldwide. : It completed 1,440 orbits over three months

Launched on October 4, 1957, by the Soviet Union, Sputnik 1 triggered the Space Race. : It completed 1