Abell 2142
... that Abell 2142, a galaxy cluster, is one of the most massive objects in the universe?
... that <b id="mwA7k"><a href="./Abell_2142" id="mwA7o" rel="mw:WikiLink" title="Abell 2142">Abell 2142</a></b>, a <a href="./Galaxy_cluster" id="mwA7s" rel="mw:WikiLink" title="Galaxy cluster">galaxy cluster</a>, is one of the most massive objects in the universe?