Mars InSight: mission unveils surprising secrets of red planet’s interior – new research A third study identified eight low-frequency marsquakes that produced both direct and reflected waves, and used these to create and test different models of the Martian crust and mantle.By comparing the data and the models, they found that Marss lithosphere is between 400km and 600km thick. PTI | Bristol | Updated: 23-07-2021 11:18 IST | Created: 23-07-2021 10:53 IST Representative Image Image Credit: Pixabay Country: SHARE We may have walked on the Moon and sent probes across the solar system, but we know very little about what's going on inside other planets. Now, for the first time, we have been able to view the interior of one, thanks to Nasa's Mars InSight probe. The probe, which landed in 2018, is equipped with a solar-powered lander bristling with equipment, including a seismometer (a very sensitive vibration detector).