Graphic artist concept of Comet Hopper. Commet is a spacecraft which would study the evolution of 46P/Wirtanen by landing on the comet multiple times and observing its changes as it interacts with the sun.
NASA
2011-05-05
<a rel="nofollow" class="external free" href="https://www.nasa.gov/centers/goddard/news/releases/2011/11-033.html">https://www.nasa.gov/centers/goddard/news/releases/2011/11-033.html</a>