NASA InSIGHT Mission: Mars Interior

Artist rendition of the formation of rocky bodies in the solar system - how they form and differentiate and evolve into terrestrial planets.

Image credit: NASA/JPL-Caltech

This picture is included in a short Nasa video about the InSIGHT mission.  

Watch the full video here.

What's Inside Mars? NASA's InSight Mission Will Probe Deeper - YouTube

Launching in 2016 and based on the successful Phoenix lander, NASA's next Mars mission will look for clues to the formation of the red planet and its rocky siblings. Why, for example, does Mars exhibit little or no plate tectonics?