<a href="https://en.wikipedia.org/wiki/Discovery_Program" id="mwASI" rel="mw:WikiLink" title="Discovery Program">Discovery Program</a>: <i id="mwASM"><a href="https://en.wikipedia.org/wiki/Lunar_Prospector" id="mwASQ" rel="mw:WikiLink" title="Lunar Prospector">Lunar Prospector</a></i>: <a href="https://en.wikipedia.org/wiki/NASA" id="mwASU" rel="mw:WikiLink" title="NASA">NASA</a> intentionally crashes the spacecraft into the Moon, thus ending its mission to detect frozen water on the Moon's surface.