Meteorite impacts and geological formations: So far, exploration of Mars has focused on its surface. The “InSight” mission of NASA and European partners starting on May 5, 2018 will now concentrate on the “inner values” of the red planet: How big is its core? Is it liquid like the Earth’s outer core or solid like the Earth’s inner core? How thick is the crust? To study the structure of Mars, NASA, among others, uses the highly sensitive instrument package SEIS with six seismometers. The qualifying model or “sister device” of one of the seismometers is currently being tested at the Joint Geoscientific Observatory (Black Forest Observatory, BFO) in Schiltach, which is operated jointly by Karlsruhe Institute of Technology (KIT) and Stuttgart University.