Kohoutek
... that Kohoutek was the first comet to be proven a dirty snowball?
... that <b id="mwAXU"><a href="./Comet_Kohoutek" id="mwAXY" rel="mw:WikiLink" title="Comet Kohoutek">Kohoutek</a></b> <i id="mwAXc">(pictured)</i> was the first comet to be proven a <a href="./Comet_nucleus" id="mwAXg" rel="mw:WikiLink" title="Comet nucleus">dirty snowball</a>?