<a href="https://en.wikipedia.org/wiki/NASA" id="mwASQ" rel="mw:WikiLink" title="NASA">NASA</a> <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Opportunity_rover" id="mwASU" rel="mw:WikiLink" title="Opportunity rover">Opportunity rover</a>, MER-B or Mars Exploration Rover–B, was launched into space aboard a <a href="https://en.wikipedia.org/wiki/Delta_II" id="mwASY" rel="mw:WikiLink" title="Delta II">Delta II</a> rocket.