Artist's impression of possible 10th planet <a href="https://en.wikipedia.org/wiki/2003_UB313" class="extiw" title="w:2003 UB313">w:2003 UB313</a>, with the <a href="//commons.wikimedia.org/wiki/Sun" title="Sun">Sun</a> in the distance.
NASA/JPL-Caltech
<a rel="nofollow" class="external autonumber" href="http://www.nasa.gov/vision/universe/solarsystem/newplanet-072905-images.html">[1]</a>, <a rel="nofollow" class="external autonumber" href="http://photojournal.jpl.nasa.gov/catalog/PIA08003">[2]</a>, <a href="https://en.wikipedia.org/wiki/Michael_E._Brown" class="extiw" title="en:Michael E. Brown">Mike Brown</a> version of this image: <a rel="nofollow" class="external free" href="http://web.gps.caltech.edu/~mbrown/planetlila/moon/PlanetXMoon.jpg">http://web.gps.caltech.edu/~mbrown/planetlila/moon/PlanetXMoon.jpg</a>