<p>Sputnik 1 (<a title="Help:IPA/English" href= "https://en.wikipedia.org/wiki/Help:IPA/English">/ˈspʌtnɪk, ˈspʊtnɪk/</a>, <a title= "Russian language" href= "https://en.wikipedia.org/wiki/Russian_language">Russian</a>: Спутник-1, <em>Satellite 1</em>), often referred to as simply Sputnik, was the first artificial Earth <a title="Satellite" href= "https://en.wikipedia.org/wiki/Satellite">satellite</a>. It was launched into an elliptical <a title="Low Earth orbit" href= "https://en.wikipedia.org/wiki/Low_Earth_orbit">low Earth orbit</a> by the <a title="Soviet Union" href= "https://en.wikipedia.org/wiki/Soviet_Union">Soviet Union</a> on 4 October 1957 as part of the <a title= "Soviet space program" href= "https://en.wikipedia.org/wiki/Soviet_space_program">Soviet space program</a>. It sent a radio signal back to Earth for three weeks before its three <a class="mw-redirect" title= "Silver-zinc battery" href= "https://en.wikipedia.org/wiki/Silver-zinc_battery">silver-zinc batteries</a> became depleted. Aerodynamic drag caused it to fall back into the atmosphere on 4 January 1958.</p>

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