of the planet mars scientists have been eager to gather data on the red planet's interior for decades. we know a lot about the surface of mars we know a lot about its atmosphere and even about its saw on a spear but we don't know very much about what goes on a mile below the surface much less two thousand miles below the surface down to the center this heat probe should be able to fill in some of those gaps developed by scientists at the german aerospace center it will measure the temperature of individual underground layers and determine how efficiently these layers conducts heat to do this the probe will have to grow deeper into mars surface than any previous drill. another instrument will monitor how much mars north pole wobbles as it orbits the sun. and for the first time a seismometer will measure seismic five gracious on mars surface caused by