“InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) is a Mars Lander that launched on May 5th 2018, and arrived on Mars on November 26th 2018.
It is a geophysical experiment. This means it measures the earthquakes as well as the wind, pressure and temperature. The lander also has a probe that can hammer its way down into the Martian surface. We will be looking to determine the structure of Mars and improve our understanding of planetary formation.
If you like, you can go to the mission overview for more information.”