12 ore 7 ottob 1957 anni - Sputnik 1

Descrizione:

The Soviet Union launches Sputnik, the first artificial satellite to orbit around the Earth. It has a mass of 83.6 kg and travels in an elliptical orbit at a height above the Earth between 939 km and 215 km. It travels at 29,000 km/h and takes 96.2 minutes for each orbit. It uses radio signals to report back to earth about data about the ionosphere. Sputnik 1 was launched during the International Geophysical Year from Site No.1/5, at the 5th Tyuratam range, in Kazakh SSR (now known as the Baikonur Cosmodrome). Only three months after Sputnik's launch, American scientist James Van Allen convinced engineers to strap a Geiger counter his team had designed to the first American satellite, Explorer 1, launched on January 31, 1958. Sputnik 1 orbited for three weeks before its batteries died, then silently for two more months before falling back into the atmosphere.

https://en.m.wikipedia.org/wiki/Sputnik_1

https://www.sciencelearn.org.nz/resources/1905-history-of-satellites-timeline

https://history.nasa.gov/sputnik

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