The TRR 170 "Late Accretion onto Terrestrial Planets" was awarded a DFG grant of about 9 Mio €  for its second funding period (2020-2023).

TRR 170 projects continue to study how terrestrial planets are formed. Current spokesperson is Thorsten Kleine at the Institut für Planetologie, University of Münster (WWU). Other projects are located at  Freie Universität Berlin, Technische Universität Berlin, Museum für Naturkunde Berlin, and the German Aerospace Center. 

TRR 170's focus is the period between 4.5 and 3.8 billion years ago. The assumption is that about 4.5 billion years ago the Moon was formed by a collision between the Earth and a body of the size of Mars. Following this event, the Earth, like other planets in the inner solar system, was continuously bombarded by asteroids. The craters on the Moon's surface are evidence of this bombardment. For a better understanding how these impacts affected Earth's evolutionary history, TRR 170 uses a multidisciplinary approach combining expertise from geochemistry, cosmochemistry, geophysics, planetary remote sensing, and astrophysics. Data from TRR 170's projects are stored in TRR 170's database TRR170-DB.