NGC 7027
... that NGC 7027 is the most extensively studied planetary nebula?
... that <b id="mwDoU"><a href="./NGC_7027" id="mwDoY" rel="mw:WikiLink" title="NGC 7027">NGC 7027</a></b> <i id="mwDoc">(pictured)</i> is the most extensively studied <a href="./Planetary_nebula" id="mwDog" rel="mw:WikiLink" title="Planetary nebula">planetary nebula</a>?