NGC 3393
... that the spiral galaxy NGC 3393 hosts the nearest known pair of supermassive black holes?
... that the <a href="./Spiral_galaxy" id="mwMA" rel="mw:WikiLink" title="Spiral galaxy">spiral galaxy</a> <b id="mwMQ"><a href="./NGC_3393" id="mwMg" rel="mw:WikiLink" title="NGC 3393">NGC 3393</a></b> hosts the nearest known pair of <a href="./Supermassive_black_hole" id="mwMw" rel="mw:WikiLink" title="Supermassive black hole">supermassive black holes</a>?