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en.wikipedia.org/wiki/Sputnik_1

Sputnik 1 was the first artificial Earth satellite. The Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957.

www.nasa.gov/multimedia/imagegallery/image_feature_924.html

On Oct. 4, 1957, Sputnik 1 successfully launched and entered Earth's orbit. ... ' fellow traveler,' but has become synonymous with 'satellite' in modern Russian.

history.nasa.gov/sputnik

Sputnik and The Dawn of the Space Age. History changed on October 4, 1957, when the Soviet Union successfully launched Sputnik I. The world's first ... Council of Scientific Unions decided to establish July 1, 1957, to December 31, 1958, ...

www.history.com/this-day-in-history/sputnik-launched

On this day in History, Sputnik launched on Oct 04, 1957. ... of more than 1 million Jews in German-occupied Russia during a one-and-a-half-year period.

www.space.com/17888-first-satellite-sputnik-1-explained-infographic.html

Oct 3, 2012 ... On Oct. 4, 1957, the Soviet Union stunned the world with its surprise launch of Sputnik 1. See how the historic satellite launch worked in this ...

www.history.com/this-day-in-history/soviet-union-launches-sputnik-i

On this day in History, Soviet Union launches Sputnik I on Oct 04, 1957. Learn more ... murder of more than 1 million Jews in German-occupied Russia during a  ...

www.russianspaceweb.com/sputnik.html

To meet politically important window, OKB-1 proposed the Soviet government an offer it could not refuse -- to precede Object D with a "prosteishy sputnik," or ...

spacenews.com/60-years-after-sputnik-russia-is-lost-in-space

Oct 4, 2017 ... MOSCOW — Just over 30 years after the Soviet Union launched the world's first satellite, Sputnik 1, the nation that opened the space race ...

www.rbth.com/science-and-tech/326323-7-facts-about-sputnik

Oct 4, 2017 ... On Oct. 4, 1957, humanity entered the space age with the launch of Sputnik 1, the world's first manmade satellite. Space travel was now a ...