68 Cygni
... that the massive blue giant star 68 Cygni is surrounded by a ring-shaped nebula?
... that the massive <a href="./Blue_giant" id="mwBNU" rel="mw:WikiLink" title="Blue giant">blue giant</a> star <b id="mwBNY"><a href="./68_Cygni" id="mwBNc" rel="mw:WikiLink" title="68 Cygni">68 Cygni</a></b> is surrounded by a ring-shaped <a href="./Nebula" id="mwBNg" rel="mw:WikiLink" title="Nebula">nebula</a>?