<a href="https://en.wikipedia.org/wiki/European_Space_Agency" id="mwAUc" rel="mw:WikiLink" title="European Space Agency">ESA</a>'s <a href="https://en.wikipedia.org/wiki/SMART-1" id="mwAUg" rel="mw:WikiLink" title="SMART-1">SMART-1</a> lunar orbiter discovers elements such as <a href="https://en.wikipedia.org/wiki/Calcium" id="mwAUk" rel="mw:WikiLink" title="Calcium">calcium</a>, <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Aluminum" id="mwAUo" rel="mw:WikiLink" title="Aluminum">aluminum</a>, <a href="https://en.wikipedia.org/wiki/Silicon" id="mwAUs" rel="mw:WikiLink" title="Silicon">silicon</a>, <a href="https://en.wikipedia.org/wiki/Iron" id="mwAUw" rel="mw:WikiLink" title="Iron">iron</a>, and other surface elements on the Moon.