What's Inside Mars? NASA's InSight Mission Will Probe Deep | Video

Launching in 2018 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?

The Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) mission was originally scheduled for a 2016 launch, but experienced a technical issue causing the delay. (Updated on September 2, 2016)

credit : NASA/JPL