Cleopatra Patera
... that until the results from the Magellan mission, the impact crater Cleopatra Patera on Venus was believed to be a volcano?
... that until the results from the <a href="./Magellan_(spacecraft)" id="mwBUU" rel="mw:WikiLink" title="Magellan (spacecraft)">Magellan mission</a>, the impact crater <b id="mwBUY"><a class="mw-redirect" href="./Cleopatra_Patera" id="mwBUc" rel="mw:WikiLink" title="Cleopatra Patera">Cleopatra Patera</a></b> on Venus was believed to be a volcano?