<a href="https://en.wikipedia.org/wiki/J._Robert_Oppenheimer" id="mw4w" rel="mw:WikiLink" title="J. Robert Oppenheimer">J. Robert Oppenheimer</a> and his student <a href="https://en.wikipedia.org/wiki/Hartland_Snyder" id="mw5A" rel="mw:WikiLink" title="Hartland Snyder">Hartland Snyder</a> publish the <a href="https://en.wikipedia.org/wiki/Oppenheimer–Snyder_model" id="mw5Q" rel="mw:WikiLink" title="Oppenheimer–Snyder model">Oppenheimer–Snyder model</a>, proving for the first time in contemporary physics how <a href="https://en.wikipedia.org/wiki/Black_hole" id="mw5g" rel="mw:WikiLink" title="Black hole">black holes</a> could develop.<sup about="#mwt79" class="mw-ref reference" data-mw='{"name":"ref","attrs":{"name":":02"},"body":{"id":"mw-reference-text-cite_note-:02-16"}}' id="cite_ref-:02_16-0" rel="dc:references" typeof="mw:Extension/ref"><a href="./September_1#cite_note-:02-16" id="mw5w" style="counter-reset: mw-Ref 16;"><span class="mw-reflink-text" id="mw6A">[16]</span></a></sup>