Charles Thomas Bolton
... that Charles Thomas Bolton was the first astronomer to prove the existence of a black hole?
... that <b id="mwDus"><a class="mw-redirect" href="./Charles_Thomas_Bolton" id="mwDuw" rel="mw:WikiLink" title="Charles Thomas Bolton">Charles Thomas Bolton</a></b> was the first <a href="./Astronomer" id="mwDu0" rel="mw:WikiLink" title="Astronomer">astronomer</a> to prove the existence of a <a href="./Black_hole" id="mwDu4" rel="mw:WikiLink" title="Black hole">black hole</a>?