From a recent announcement about Ph.D. research in solar system science:
The International Max Planck Research School for Solar System Science at the University of Göttingen ( http://www.solar-system-school.de) invites applications for several PhD positions to start in 2019.
Full details may be found at https://www.mps.mpg.de/phd/applynow
The application window opens on October 1, with a deadline of November 15, 2018.