Stingray Nebula
...that the Stingray Nebula, discovered in 1987, is the youngest known planetary nebula?
...that the <b id="mwBHQ"><a href="./Stingray_Nebula" id="mwBHU" rel="mw:WikiLink" title="Stingray Nebula">Stingray Nebula</a></b>, discovered in 1987, is the youngest known <a href="./Planetary_nebula" id="mwBHY" rel="mw:WikiLink" title="Planetary nebula">planetary nebula</a>?