<a href="https://en.wikipedia.org/wiki/Soviet_atomic_bomb_project" id="mwATE" rel="mw:WikiLink" title="Soviet atomic bomb project">Soviet atomic bomb project</a>: The <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwATI" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> tests its first <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Atomic_bomb" id="mwATM" rel="mw:WikiLink" title="Atomic bomb">atomic bomb</a>, known as <i id="mwATQ"><a href="https://en.wikipedia.org/wiki/RDS-1" id="mwATU" rel="mw:WikiLink" title="RDS-1">First Lightning</a></i> or <i id="mwATY">Joe 1</i>, at <a href="https://en.wikipedia.org/wiki/Semipalatinsk_Test_Site" id="mwATc" rel="mw:WikiLink" title="Semipalatinsk Test Site">Semipalatinsk</a>, <a href="https://en.wikipedia.org/wiki/Kazakhstan" id="mwATg" rel="mw:WikiLink" title="Kazakhstan">Kazakhstan</a>.