Valhalla
... that the Valhalla structure on Jupiter's moon Callisto is the largest multi-ring basin in the Solar System?
... that the <b id="mwEbU"><a href="./Valhalla_(crater)" id="mwEbY" rel="mw:WikiLink" title="Valhalla (crater)">Valhalla</a></b> structure <i id="mwEbc">(pictured)</i> on <a href="./Jupiter" id="mwEbg" rel="mw:WikiLink" title="Jupiter">Jupiter</a>'s moon <a href="./Callisto_(moon)" id="mwEbk" rel="mw:WikiLink" title="Callisto (moon)">Callisto</a> is the largest multi-ring basin in the <a href="./Solar_System" id="mwEbo" rel="mw:WikiLink" title="Solar System">Solar System</a>?