<i id="mwrQ"><a href="https://en.wikipedia.org/wiki/Sputnik_1" id="mwrg" rel="mw:WikiLink" title="Sputnik 1">Sputnik 1</a></i> becomes the first artificial satellite to orbit the Earth.<sup about="#mwt45" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-7"}}' id="cite_ref-7" rel="dc:references" typeof="mw:Extension/ref"><a href="./October_4#cite_note-7" id="mwrw" style="counter-reset: mw-Ref 7;"><span class="mw-reflink-text" id="mwsA">[7]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-7"><cite about="#mwt42" class="citation book cs1" id="CITEREFBurgessHall2009">Burgess, Colin; Hall, Rex (2009). <i id="mwBxY">The First Soviet Cosmonaut Team: Their Lives, Legacy, and Historical Impact</i>. Berlin: Springer. p.<span id="mwBxc" typeof="mw:Entity"> </span>1. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBxg" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBxk" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780387848235" id="mwBxo" rel="mw:WikiLink" title="Special:BookSources/9780387848235"><bdi id="mwBxs">9780387848235</bdi></a>. <a class="mw-redirect" href="./LCCN_(identifier)" id="mwBxw" rel="mw:WikiLink" title="LCCN (identifier)">LCCN</a><span id="mwBx0" typeof="mw:Entity"> </span><a class="external text" href="https://lccn.loc.gov/2008935694" id="mwBx4" rel="mw:ExtLink nofollow">2008935694</a>.</cite><span about="#mwt42" class="Z3988" id="mwBx8" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=The+First+Soviet+Cosmonaut+Team%3A+Their+Lives%2C+Legacy%2C+and+Historical+Impact&amp;rft.place=Berlin&amp;rft.pages=1&amp;rft.pub=Springer&amp;rft.date=2009&amp;rft_id=info%3Alccn%2F2008935694&amp;rft.isbn=9780387848235&amp;rft.aulast=Burgess&amp;rft.aufirst=Colin&amp;rft.au=Hall%2C+Rex&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AOctober+4"></span></span>