The first discoveries of <a href="https://en.wikipedia.org/wiki/Exoplanet" id="mwAWI" rel="mw:WikiLink" title="Exoplanet">extrasolar planets</a> are announced by astronomers <a href="https://en.wikipedia.org/wiki/Aleksander_Wolszczan" id="mwAWM" rel="mw:WikiLink" title="Aleksander Wolszczan">Aleksander Wolszczan</a> and <a href="https://en.wikipedia.org/wiki/Dale_Frail" id="mwAWQ" rel="mw:WikiLink" title="Dale Frail">Dale Frail</a>. They discovered two planets orbiting the pulsar <a href="https://en.wikipedia.org/wiki/PSR_B1257+12" id="mwAWU" rel="mw:WikiLink" title="PSR B1257+12">PSR 1257+12</a>.<sup about="#mwt214" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-39"}}' id="cite_ref-39" rel="dc:references" typeof="mw:Extension/ref"><a href="./January_9#cite_note-39" id="mwAWY" style="counter-reset: mw-Ref 39;"><span class="mw-reflink-text" id="mwAWc">[39]</span></a></sup>
<span class="mw-reference-text reference-text" id="mw-reference-text-cite_note-39"><cite about="#mwt211" class="citation journal cs1" id="CITEREFWolszczanFrail1992">Wolszczan, A.; Frail, D. A. (1992). "A planetary system around the millisecond pulsar PSR1257 + 12". <i id="mwCSU">Nature</i>. <b id="mwCSY">355</b> (6356): 145–147. <a class="mw-redirect" href="./Bibcode_(identifier)" id="mwCSc" rel="mw:WikiLink" title="Bibcode (identifier)">Bibcode</a>:<a class="external text" href="https://ui.adsabs.harvard.edu/abs/1992Natur.355..145W" id="mwCSg" rel="mw:ExtLink nofollow">1992Natur.355..145W</a>. <a class="mw-redirect" href="./Doi_(identifier)" id="mwCSk" rel="mw:WikiLink" title="Doi (identifier)">doi</a>:<a class="external text" href="https://doi.org/10.1038%2F355145a0" id="mwCSo" rel="mw:ExtLink nofollow">10.1038/355145a0</a>. <a class="mw-redirect" href="./S2CID_(identifier)" id="mwCSs" rel="mw:WikiLink" title="S2CID (identifier)">S2CID</a><span id="mwCSw" typeof="mw:Entity"> </span><a class="external text" href="https://api.semanticscholar.org/CorpusID:4260368" id="mwCS0" rel="mw:ExtLink nofollow">4260368</a>.</cite><span about="#mwt211" class="Z3988" id="mwCS4" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Nature&amp;rft.atitle=A+planetary+system+around+the+millisecond+pulsar+PSR1257+%2B+12&amp;rft.volume=355&amp;rft.issue=6356&amp;rft.pages=145-147&amp;rft.date=1992&amp;rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A4260368%23id-name%3DS2CID&amp;rft_id=info%3Adoi%2F10.1038%2F355145a0&amp;rft_id=info%3Abibcode%2F1992Natur.355..145W&amp;rft.aulast=Wolszczan&amp;rft.aufirst=A.&amp;rft.au=Frail%2C+D.+A.&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJanuary+9"></span></span>