The <a href="https://en.wikipedia.org/wiki/ChemCam" class="extiw" title="w:ChemCam">ChemCam</a> of the <a href="https://en.wikipedia.org/wiki/Curiosity_rover" class="extiw" title="w:Curiosity rover">Curiosity rover</a>, with the Calibration Target Assembly circled.
NASA
2012-08-16
<a rel="nofollow" class="external text" href="https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA16069">PIA16069</a>, Jet Propulsion Laboratory